{"title":"Side + Quad Rear Fins","description":"\u003cp\u003eShop \u003ca href=\"\/collections\/side-quad-rear-fins\"\u003eside fins and quad rear fins\u003c\/a\u003e at Rider Shack. Side bite fins complete a 2+1 setup on midlengths and longboards. Quad rears complete a quad configuration on 5-fin or dedicated quad boards.\u003c\/p\u003e\u003cp\u003eBrowse \u003ca href=\"\/collections\/single-fins\"\u003eSingle Fins\u003c\/a\u003e · \u003ca href=\"\/collections\/quad-fins\"\u003eQuad Fins\u003c\/a\u003e · all \u003ca href=\"\/collections\/surfboard-fins\"\u003esurfboard fins\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"fcs-ii-reactor-medium-quad-rear-surfboard-fins","title":"FCS II Reactor Medium Quad Rear Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Reactor Performance Core Medium Quad Rear Surfboard Fins\u003c\/strong\u003e are designed to enhance your quad setup with a snappier, more responsive feel through turns. Featuring a very upright template, these fins provide exceptional agility and control, making them ideal for tight maneuvers and quick directional changes.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eThis set includes two medium-sized fins, perfect for quad rear positions or as sidebites. Made with FCS Performance Core material, these fins deliver a lightweight yet durable construction for consistent high-performance surfing.\u003c\/p\u003e\r\n\r\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eUpright Template:\u003c\/strong\u003e Optimized for snappy turns and quick directional changes in your quad setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear or Sidebite Fins:\u003c\/strong\u003e Includes two medium fins for versatile positioning options.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS Performance Core Material:\u003c\/strong\u003e Lightweight and durable for reliable, high-performance surfing.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Maneuverability:\u003c\/strong\u003e Adds responsiveness to your quad fin configuration for tight maneuvers.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eMedium Size Template:\u003c\/strong\u003e Ideal for surfers seeking balanced control and snappier performance.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Compatible with the FCS II fin system for tool-free setup and adjustments.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003cp\u003eUpgrade your quad fin setup with the \u003cstrong\u003eFCS II Reactor Performance Core Medium Quad Rear Surfboard Fins\u003c\/strong\u003e. Built for surfers seeking quick turns and enhanced agility, these fins are a must-have for performance-focused surfing. Order your set today and experience the snappy precision of FCS Reactor fins!\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52178857984283,"sku":"108301","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-reactor-medium-quad-rear-surfboard-fins-6651286.jpg?v=1791582170"},{"product_id":"fin-solutions-fcs-gx-side-bite-quad-rear-fin-set","title":"Fin Solutions FCS GX Side Bite Quad Rear Fin Set","description":"\u003carticle\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFin Solutions FCS 2 Tab GX Side Bite Fins\u003c\/strong\u003e are a versatile set of two fins designed to enhance your surfboard’s performance in \u003cstrong\u003equad rear setups or 2+1 configurations\u003c\/strong\u003e. Whether you’re looking for extra hold, stability, or maneuverability, these side bite fins will help fine-tune your ride.\u003c\/p\u003e\r\n\r\n    \u003ch2\u003eKey Features:\u003c\/h2\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eCompatible with FCS 2 Tab System:\u003c\/strong\u003e Easy to install and remove without tools.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eVersatile Performance:\u003c\/strong\u003e Great for use as \u003cstrong\u003equad rear fins or in a 2+1 setup\u003c\/strong\u003e for added control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Stability \u0026amp; Drive:\u003c\/strong\u003e Provides extra hold and improves turning response.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made for long-lasting performance in a variety of conditions.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSet of Two Fins:\u003c\/strong\u003e Perfect for customizing your board’s setup.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003cp\u003eUpgrade your surfboard with the \u003cstrong\u003eFin Solutions FCS 2 Tab GX Side Bite Fins\u003c\/strong\u003e and experience a \u003cstrong\u003emore controlled and responsive ride\u003c\/strong\u003e. Whether you're setting up a \u003cstrong\u003equad fin configuration or a 2+1 longboard setup\u003c\/strong\u003e, these fins are the perfect addition to your quiver!\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"Rider Shack","offers":[{"title":"Default Title","offer_id":52178886787355,"sku":"109815","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fin-solutions-fcs-gx-side-bite-quad-rear-fin-set-6705437.jpg?v=1781033648"},{"product_id":"fcs-ii-h4-quad-rear-medium-surfboard-fin-set","title":"FCS II H4 Quad Rear Medium Surfboard Fin Set","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/strong\u003e delivers the same cutting-edge precision and control as the revolutionary H4 thruster set. Designed with \u003cstrong\u003eSwiss engineering\u003c\/strong\u003e and an evolved hydrodynamic template, these quad rears offer an unprecedented level of \u003cstrong\u003espeed, stability, and predictability\u003c\/strong\u003e at high velocity. Perfectly matched to both the \u003cstrong\u003eMedium\u003c\/strong\u003e and \u003cstrong\u003eLarge H4 front fins\u003c\/strong\u003e, this set provides enhanced drive and control while maintaining agility and responsiveness through turns. Let’s go surfing!\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSwiss Engineered Design:\u003c\/strong\u003e Precision construction for maximum control, speed, and hydrodynamic efficiency.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eOptimized for H4 Fronts:\u003c\/strong\u003e Pairs seamlessly with both Medium and Large H4 sets for a balanced, high-performance quad setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePredictable Performance:\u003c\/strong\u003e Provides stability and control even at high speeds, maintaining hold in critical sections.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced Drive \u0026amp; Hold:\u003c\/strong\u003e Quad rear configuration adds grip and flow while keeping turning response sharp and intuitive.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Tool-Less System:\u003c\/strong\u003e Quick and easy fin installation with no screws or keys required.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose the FCS II H4 Quad Rears?\u003c\/h3\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II H4 Quad Rear Fins\u003c\/strong\u003e expand the performance of your H4 setup by adding rear-end stability, drive, and speed without sacrificing maneuverability. Their unique foil and futuristic template deliver the same precision and control that define the H4 series, making them ideal for surfers chasing performance in faster, more powerful waves.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eUpgrade your setup with the \u003cstrong\u003eFCS II H4 Quad Rear Medium Surfboard Fin Set\u003c\/strong\u003e—the perfect complement to your H4 fronts for speed, flow, and next-level control.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52178896781595,"sku":"110139","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-h4-quad-rear-medium-surfboard-fin-set-3789919.jpg?v=1781033528"},{"product_id":"fcs-ii-performer-neo-glass-quad-rear-surfboard-fin-set","title":"FCS II Performer Neo Glass Quad Rear Surfboard Fin Set","description":"The FCS II Performer fin is a balance of speed, flow and response. Suitable for all conditions. Throw in a quad set for maximum grip and drive!\r\n\r\nIn Neo Glass construction, using long strand fiberglass and a marine grade polymer. These fins have a lively flex pattern at a great price. \r\n\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52178951307547,"sku":"112392","price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-performer-neo-glass-quad-rear-surfboard-fin-set-9913116.jpg?v=1781032925"},{"product_id":"fcs-ii-performer-pc-medium-quad-rear-tranquil-blue-surfboard-fins","title":"FCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Performer PC Medium Quad Rear Fins\u003c\/strong\u003e in Tranquil Blue are crafted for surfers seeking a balanced blend of speed, flow, and responsiveness. These fins are versatile and suitable for a wide variety of wave conditions, making them an essential addition to your setup.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBalanced Template:\u003c\/strong\u003e Incorporates Inside Foil Technology (IFT) for enhanced drive and maneuverability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Lightweight resin transfer molding ensures consistent flex and durability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed as a two-fin set for use in quad configurations, offering added stability and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Fin System Compatibility:\u003c\/strong\u003e Tool-less system allows for easy and secure installation or removal.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eDimensions\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e 4.26 inches (108 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 4.09 inches (104 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eArea:\u003c\/strong\u003e 12.63 square inches (8150 mm²)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSweep:\u003c\/strong\u003e 32.4°\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFoil:\u003c\/strong\u003e 80\/20\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose FCS II Performer PC Medium Quad Rear Fins?\u003c\/h3\u003e\r\n    \u003cp\u003eThese fins are designed to provide excellent all-around performance, making them perfect for surfers who value versatility in their gear. With a balanced template and high-quality construction, the FCS II Performer PC Medium Quad Rear Fins deliver a reliable combination of speed and control, suitable for various board shapes and surfing styles.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eUpgrade your quad fin setup with the FCS II Performer PC Medium Quad Rear Tranquil Blue Surfboard Fins and enjoy enhanced performance across diverse conditions.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179143262491,"sku":"115406","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-performer-pc-medium-quad-rear-tranquil-blue-surfboard-fins-6215550.jpg?v=1780872667"},{"product_id":"fcs-ii-performer-pc-large-quad-rear-tranquil-blue-surfboard-fins","title":"FCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Performer PC Large Quad Rear Fins\u003c\/strong\u003e in Tranquil Blue are designed to provide a balance of speed, flow, and response, making them a reliable choice for surfers seeking all-around performance across various conditions.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eWell-Proportioned Template:\u003c\/strong\u003e Features Inside Foil Technology (IFT) for a balance of drive and maneuverability.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Multi-layered resin transfer molding process offers a lightweight yet responsive fin.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Includes two fins designed to be used as rear fins in a quad setup, enhancing stability and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Fin System Compatibility:\u003c\/strong\u003e Designed to fit the FCS II Fin System for quick and secure installation.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eDimensions\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e 4.09 inches (104 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eDepth:\u003c\/strong\u003e 4.25 inches (108 mm)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eArea:\u003c\/strong\u003e 12.64 square inches (8150 mm²)\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eSweep:\u003c\/strong\u003e 32.4°\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose FCS II Performer PC Large Quad Rear Fins?\u003c\/h3\u003e\r\n    \u003cp\u003eThese fins are ideal for surfers who desire a reliable all-around fin that delivers a combination of speed and maneuverability with smooth transitions between turns. The Performance Core construction ensures a consistent feel across a variety of conditions, making them suitable for different board types and surfing styles.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eEnhance your surfing experience with the FCS II Performer PC Large Quad Rear Tranquil Blue Surfboard Fins, and enjoy a balanced performance in diverse wave conditions.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179143295259,"sku":"115407","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-performer-pc-large-quad-rear-tranquil-blue-surfboard-fins-6850925.jpg?v=1780872668"},{"product_id":"fcs-ii-carver-neo-glass-quad-rear-eucalyptus-surfboard-fin-set","title":"FCS II Carver Neo Glass Quad Rear Eucalyptus Surfboard Fin Set","description":"\u003carticle\u003e\r\n  \u003ch2\u003eFCS II Carver Neo Glass Quad Rear Fin Set – Eucalyptus\u003c\/h2\u003e\r\n  \u003cp\u003eDesigned for speed, hold, and control, the \u003cstrong\u003eFCS II Carver Neo Glass Quad Rear Fin Set\u003c\/strong\u003e in Eucalyptus is your go-to option for powering through long, drawn-out turns on open face waves. Perfect as rear fins in a quad setup, this pair adds stability and drive for surfers who love flowing lines and committed rail surfing.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eConstructed with \u003cstrong\u003eNeo Glass material\u003c\/strong\u003e, these fins deliver a responsive flex pattern and lightweight durability. The elongated template with a high sweep angle promotes excellent hold and control, especially when you're drawing out your turns in clean conditions.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eTemplate:\u003c\/strong\u003e Carver – designed for surfers who like to push hard on their rail and carve on open faces.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Neo Glass – high-fiberglass content blend for strength, durability, and snappy performance.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eSetup:\u003c\/strong\u003e Quad rear pair (2 fins) – compatible with quad fin configurations.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eIdeal Conditions:\u003c\/strong\u003e Best for down-the-line waves and point breaks with open face walls.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFCS II System:\u003c\/strong\u003e Tool-less fin installation and removal – no screws required.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eColorway:\u003c\/strong\u003e Eucalyptus – a refined green tone for understated style.\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e\r\n  \u003cp\u003eAt \u003cstrong\u003eRider Shack\u003c\/strong\u003e, we carry the fins we trust in our own boards. Whether you're dialing in your quad setup for powerful lines or experimenting with speed and hold, we’ve got your back with expert advice and premium gear. The \u003cstrong\u003eFCS II Carver Neo Glass Quad Rear Set\u003c\/strong\u003e brings high performance with style to your next session.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eUpgrade your quad configuration with the responsive drive of the Carver Neo Glass rears—available now at Rider Shack.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179614728475,"sku":"117491","price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-carver-neo-glass-quad-rear-eucalyptus-surfboard-fin-set-4183585.jpg?v=1780869065"},{"product_id":"fcs-ii-carver-pc-medium-quad-rear-eucalyptus-surfboard-fins","title":"FCS II Carver PC Medium Quad Rear Eucalyptus Surfboard Fins","description":"\u003carticle\u003e  \r\n  \u003ch2\u003eFCS II Carver PC Medium Quad Rear Eucalyptus Surfboard Fins\u003c\/h2\u003e  \r\n  \u003cp\u003eThe \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e are designed for surfers who want maximum drive, control, and precision through powerful turns. Ideal for open-face waves and surfers who like to push hard on the rail, these quad rears provide extra hold and projection without sacrificing speed.\u003c\/p\u003e  \r\n\r\n  \u003cp\u003eCrafted with \u003cstrong\u003ePerformance Core (PC) construction\u003c\/strong\u003e, these fins deliver a reliable flex pattern and lightweight feel, allowing for dynamic responsiveness in all conditions. The eucalyptus colorway adds a sleek finish to your setup while complementing the FCS II tool-less fin system for easy in-and-out adjustments.\u003c\/p\u003e  \r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e  \r\n  \u003cul\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003ePerformance Core Construction:\u003c\/strong\u003e Lightweight with consistent flex, delivering speed, drive, and control.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eCarver Template:\u003c\/strong\u003e Engineered for powerful, drawn-out turns with exceptional hold on open-face waves.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed to pair with your front fins to create a high-performance quad setup.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eFCS II System:\u003c\/strong\u003e Quick and tool-less fin changes—no screws or plates required.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eMedium Size:\u003c\/strong\u003e Versatile fit for a broad range of surfers and conditions.\u003c\/li\u003e  \r\n    \u003cli\u003e\n\u003cstrong\u003eEucalyptus Colorway:\u003c\/strong\u003e Stylish and modern look for your board.\u003c\/li\u003e  \r\n  \u003c\/ul\u003e  \r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e  \r\n  \u003cp\u003eAt \u003cstrong\u003eRider Shack\u003c\/strong\u003e, we know that fins are just as important as your board when it comes to performance. Since 2006, our family-run surf shop has been helping surfers dial in their setups with the best gear available. The \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e are a shop favorite for their ability to generate hold, power, and control while keeping your surfing sharp and stylish.\u003c\/p\u003e  \r\n\r\n  \u003cp\u003eUpgrade your quad setup with the \u003cstrong\u003eFCS II Carver PC Medium Quad Rear Fins\u003c\/strong\u003e—available now at Rider Shack.\u003c\/p\u003e  \r\n\u003c\/article\u003e  \r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179632816411,"sku":"117719","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-carver-pc-medium-quad-rear-eucalyptus-surfboard-fins-3434605.jpg?v=1780868706"},{"product_id":"fcs-ii-jon-pyzel-medium-quad-rear-surfboard-fins","title":"FCS II Jon Pyzel Medium Quad Rear Surfboard Fins","description":"\u003carticle\u003e\r\n    \u003ch2\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/h2\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/strong\u003e are designed in collaboration with \u003cstrong\u003eJon Pyzel\u003c\/strong\u003e, the world-renowned shaper behind some of the best-performing surfboards on the planet. Built to complement the Pyzel signature thruster and quad templates, these rear fins offer a perfect balance of drive, control, and flow—ideal for surfers looking to fine-tune their quad setups for powerful, responsive performance.\u003c\/p\u003e\r\n\r\n    \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n    \u003cul\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eJon Pyzel Signature Design:\u003c\/strong\u003e Crafted in collaboration with Pyzel Surfboards for predictable, high-speed performance.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eQuad Rear Set:\u003c\/strong\u003e Designed to pair with Pyzel or other FCS II front fins to create a balanced quad configuration.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eMedium Size:\u003c\/strong\u003e Ideal for surfers weighing 145–175 lbs or those seeking a responsive, all-around setup.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Template:\u003c\/strong\u003e Slightly raked outline provides hold and stability while allowing smooth, flowing transitions.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003ePerformance Core (PC) Construction:\u003c\/strong\u003e Lightweight, durable material offering a responsive flex pattern for speed and control.\u003c\/li\u003e\r\n        \u003cli\u003e\n\u003cstrong\u003eFCS II Tool-Less System:\u003c\/strong\u003e Quick and easy fin installation and removal with no screws or keys required.\u003c\/li\u003e\r\n    \u003c\/ul\u003e\r\n\r\n    \u003ch3\u003eWhy Choose the FCS II Jon Pyzel Quad Rears?\u003c\/h3\u003e\r\n    \u003cp\u003eThe \u003cstrong\u003eFCS II Pyzel Quad Rear Fins\u003c\/strong\u003e are perfect for surfers who want to enhance their board’s performance in various conditions. Whether chasing clean point breaks or carving punchy beach breaks, these fins deliver smooth drive with a controlled release. Designed to complement Jon Pyzel’s modern high-performance boards, they provide the perfect combination of speed, hold, and maneuverability.\u003c\/p\u003e\r\n\r\n    \u003cp\u003eComplete your setup with the \u003cstrong\u003eFCS II Jon Pyzel Medium Quad Rear Surfboard Fins\u003c\/strong\u003e—a precision-crafted addition to your FCS II system for versatile, high-speed surfing.\u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":52179654148379,"sku":"117954","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-jon-pyzel-medium-quad-rear-surfboard-fins-8811147.jpg?v=1780868288"},{"product_id":"roam-futures-side-bite-fin-set","title":"Roam Futures Side Bite Fin Set","description":"","brand":"Roam","offers":[{"title":"Smoke \/ MD","offer_id":52179749044507,"sku":"118470|Smoke|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Black \/ MD","offer_id":52179749077275,"sku":"118470|Black|MD","price":57.0,"currency_code":"USD","in_stock":true},{"title":"Clear \/ MD","offer_id":52179749110043,"sku":"118470|Clear|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Ice Blue \/ MD","offer_id":52179749142811,"sku":"118470|Ice Blue|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Burgundy \/ MD","offer_id":52179749175579,"sku":"118470|Burgundy|MD","price":57.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/roam-futures-side-bite-fin-set-1652796.jpg?v=1780867449"},{"product_id":"roam-fcs-2-tab-quad-rear-fin-set","title":"Roam FCS Quad Rear Fin Set","description":"","brand":"Roam","offers":[{"title":"Smoke \/ MD","offer_id":52179749339419,"sku":"118473|Smoke|MD","price":67.0,"currency_code":"USD","in_stock":false},{"title":"Black \/ MD","offer_id":52179749372187,"sku":"118473|Black|MD","price":67.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/roam-fcs-quad-rear-fin-set-2987735.jpg?v=1791280148"},{"product_id":"fcs-ii-channel-islands-solution-quad-rear-fins-lg","title":"FCS II Channel Islands Solution Quad Rear Fins LG","description":"\u003cdiv class=\"product-description\"\u003e\r\n  \u003ch2\u003eFCS II Channel Islands Solution Quad Rear Fin Set - Large\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe FCS II Channel Islands Solution Quad Rear Fin Set in Large is a fast, controlled, and highly responsive rear fin set designed by Britt Merrick and developed in collaboration with Channel Islands Surfboards. Based on the popular CI Upright template, this rear set is built to pair seamlessly with the upright CI side fins and create a performance quad setup focused on speed, hold, and tight, pivot-driven turns.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eFeaturing a neutral-raked template and refined 80\/20 foil, the Solution Quad Rears offer a balanced feel underfoot with the stability needed to hold clean lines through critical sections while still allowing for quick release and fast direction changes. This combination makes them an excellent choice for surfers who want a quad setup that feels lively and performance-minded without losing control. When paired with CI Solution side fins, they help enhance overall drive and hold while maintaining the loose, responsive release that makes a good quad setup so fun to ride.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eBuilt in Performance Core construction, these fins are lightweight with a progressive flex pattern that supports speed, control, and versatility across a wide range of surf conditions. While they excel in punchy, hollow waves where responsiveness matters most, they also work beautifully in open-face waves and down-the-line point break surf where speed and directional control come alive.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eDesigned by Britt Merrick in collaboration with Channel Islands Surfboards\u003c\/li\u003e\r\n    \u003cli\u003eBased on the proven CI Upright design\u003c\/li\u003e\r\n    \u003cli\u003eNeutral rake offers a strong balance of control and pivot\u003c\/li\u003e\r\n    \u003cli\u003e80\/20 foil improves stability and directional control\u003c\/li\u003e\r\n    \u003cli\u003eBuilt to pair with CI Solution side fins for a high-performance quad setup\u003c\/li\u003e\r\n    \u003cli\u003ePerformance Core construction delivers lightweight feel and responsive flex\u003c\/li\u003e\r\n    \u003cli\u003eExcellent for speed, tight turns, and clean release\u003c\/li\u003e\r\n    \u003cli\u003eIdeal for punchy, hollow waves and high-performance surfing\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Feel\u003c\/h3\u003e\r\n  \u003cp\u003eThe Channel Islands Solution Quad Rears feel fast, controlled, and highly responsive. The upright-inspired template supports quick transitions and tight, pivot-style turns, while the 80\/20 foil helps keep the board stable and predictable through critical maneuvers. When paired with CI Solution side fins, this rear set adds drive and hold without sacrificing release.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eOpen-face waves\u003c\/li\u003e\r\n    \u003cli\u003eDown-the-line point breaks\u003c\/li\u003e\r\n    \u003cli\u003eLong, carving turns on clean walls\u003c\/li\u003e\r\n    \u003cli\u003ePunchy, hollow surf where speed and responsiveness matter\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eModel: FCS II Channel Islands Solution Quad Rear Set\u003c\/li\u003e\r\n    \u003cli\u003eSize: Large\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Family: Carver\u003c\/li\u003e\r\n    \u003cli\u003eConstruction: Performance Core\u003c\/li\u003e\r\n    \u003cli\u003eFin System: FCS II\u003c\/li\u003e\r\n    \u003cli\u003eTemplate Feel: Speed, control, and tight directional surfing\u003c\/li\u003e\r\n    \u003cli\u003eFoil: 80\/20\u003c\/li\u003e\r\n    \u003cli\u003eRecommended For: CI Performance Boards, especially the CI Solution\u003c\/li\u003e\r\n    \u003cli\u003eDesigned To Pair With: CI Solution Side Fins\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cp\u003eWhen you shop at Rider Shack, you’re supporting a small business and core surf shop run by surfers who care about quality gear, real surf knowledge, and genuine customer service.\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52197525913883,"sku":"118764","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-channel-islands-solution-quad-rear-fins-lg-1868101.jpg?v=1780867207"},{"product_id":"flying-diamonds-cj-skylimit-side-bites-1","title":"Flying Diamonds CJ Skylimit Side Bites","description":"","brand":"Flying Diamonds","offers":[{"title":"Volan","offer_id":52322435793179,"sku":"118945|Volan","price":65.0,"currency_code":"USD","in_stock":false},{"title":"Red Volan","offer_id":52322435825947,"sku":"118945|Red Volan","price":65.0,"currency_code":"USD","in_stock":true},{"title":"G10","offer_id":52322435858715,"sku":"118945|G10","price":65.0,"currency_code":"USD","in_stock":false},{"title":"Black Volan","offer_id":52322435891483,"sku":"118945|Black Volan","price":65.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/flying-diamonds-cj-skylimit-side-bites-6696614.jpg?v=1781127501"},{"product_id":"fcs-ii-am-pc-large-quad-rears","title":"FCS II AM PC Large Quad Rears","description":"\u003cdiv class=\"product-description\"\u003e\r\n  \u003ch2\u003eFCS II AM PC Large Quad Rear Fin Set\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe FCS II AM PC Large Quad Rear Fin Set is built for surfers who want extra speed, drive, and controlled release in a high-performance quad setup. Based on Al Merrick’s proven AM template, this rear set is designed to complement the raked AM side fins and help create a fast, progressive feel underfoot. FCS describes the AM template as designed for radical, progressive surfing, with raked side fins that produce exceptional speed and drive. :contentReference[oaicite:0]{index=0}\u003c\/p\u003e\r\n\r\n  \u003cp\u003eAs a quad rear option, this set is ideal for surfers looking to unlock more down-the-line speed while keeping the board feeling lively and responsive through turns. The AM template is especially well suited to hollow, steep waves and punchy beach breaks, making it a strong match for performance boards in better surf. :contentReference[oaicite:1]{index=1}\u003c\/p\u003e\r\n\r\n  \u003cp\u003eBuilt in Performance Core construction and designed to fit the FCS II Fin System, the FCS II AM PC Large Quad Rear Fin Set is a great choice for surfers who want a premium rear fin setup that adds speed, control, and clean release to their quad board. :contentReference[oaicite:2]{index=2}\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eBased on Al Merrick’s proven AM performance template\u003c\/li\u003e\r\n    \u003cli\u003eDesigned for speed, drive, and progressive surfing\u003c\/li\u003e\r\n    \u003cli\u003eGreat rear fin option for a fast, responsive quad setup\u003c\/li\u003e\r\n    \u003cli\u003eWorks especially well in hollow, steep waves and punchy beach breaks\u003c\/li\u003e\r\n    \u003cli\u003ePerformance Core construction offers lightweight responsive feel\u003c\/li\u003e\r\n    \u003cli\u003eDesigned to fit the FCS II Fin System\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eModel: FCS II AM PC Quad Rear Fin Set\u003c\/li\u003e\r\n    \u003cli\u003eSize: Large\u003c\/li\u003e\r\n    \u003cli\u003eConstruction: Performance Core\u003c\/li\u003e\r\n    \u003cli\u003eFin System: FCS II\u003c\/li\u003e\r\n    \u003cli\u003eBest For: Performance quad setups\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cp\u003eWhen you shop at Rider Shack, you’re supporting a small business and core surf shop run by surfers who care about quality gear, real surf knowledge, and genuine customer service.\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52368336093467,"sku":"118969","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-am-pc-large-quad-rears-9077233.jpg?v=1781793253"},{"product_id":"fcs-ii-am-pc-md-quad-rears","title":"FCS II AM PC MD Quad Rears","description":"\u003cdiv class=\"product-description\"\u003e\r\n  \u003ch2\u003eFCS II Al Merrick Quad Rear Fin Set - Medium\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe FCS II Al Merrick Quad Rear Fin Set in Medium is designed by legendary shaper Al Merrick to pair perfectly with the raked AM side fins. Built for surfers chasing a fast, controlled quad setup, these rear fins are tuned to deliver a strong balance of maneuverability and directional control in more performance-oriented surf. :contentReference[oaicite:0]{index=0}\u003c\/p\u003e\r\n\r\n  \u003cp\u003eThe defining feature here is the 50\/50 foil, which promotes smooth, longer-arc turns while maintaining exceptional stability, especially when the board is locked into the barrel. That makes this rear set a great choice for surfers who want the speed and drive of a quad without losing the hold and predictability needed in steeper, more powerful waves. FCS places this set in the Carver family, built for powerful, drawn-out turns with added hold. :contentReference[oaicite:1]{index=1}\u003c\/p\u003e\r\n\r\n  \u003cp\u003eConstructed in Performance Core, these fins use a multi-layered resin transfer molding process with a flex pattern that extends progressively from base to tip. FCS says this helps maintain drive and hold through a turn while keeping the set light and versatile across conditions. In Medium, FCS lists the rider range at 145 to 175 pounds. :contentReference[oaicite:2]{index=2}\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy You'll Love It\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eDesigned by Al Merrick to match the raked AM side fins\u003c\/li\u003e\r\n    \u003cli\u003e50\/50 foil adds smooth turning and excellent barrel stability\u003c\/li\u003e\r\n    \u003cli\u003eGreat balance of maneuverability and directional control\u003c\/li\u003e\r\n    \u003cli\u003eIdeal for hollow, steep waves and punchy beach breaks\u003c\/li\u003e\r\n    \u003cli\u003ePerformance Core construction offers light weight and versatile flex\u003c\/li\u003e\r\n    \u003cli\u003ePerfect rear set for a fast, controlled performance quad\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eModel: FCS II Al Merrick Quad Rear Fin Set\u003c\/li\u003e\r\n    \u003cli\u003eSize: Medium\u003c\/li\u003e\r\n    \u003cli\u003eConstruction: Performance Core\u003c\/li\u003e\r\n    \u003cli\u003eFin System: FCS II\u003c\/li\u003e\r\n    \u003cli\u003eFoil: 50\/50\u003c\/li\u003e\r\n    \u003cli\u003eFin Family: Carver\u003c\/li\u003e\r\n    \u003cli\u003eConfiguration: Quad Rear (2 fins)\u003c\/li\u003e\r\n    \u003cli\u003eSuggested Rider Weight: 145 - 175 lbs\u003c\/li\u003e\r\n    \u003cli\u003eBest For: Performance boards with deep concaves and moderate-to-extreme rocker\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003cp\u003eWhen you shop at Rider Shack, you’re supporting a small business and core surf shop run by surfers who care about quality gear, real surf knowledge, and genuine customer service.\u003c\/p\u003e\r\n\u003c\/div\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52368844292379,"sku":"118977","price":92.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-am-pc-md-quad-rears-7557091.jpg?v=1781793247"},{"product_id":"fcs-ii-mayhem-driver-pc-carbon-quad-rear-lg-surfboard-fins","title":"FCS II Mayhem Driver PC Carbon Quad Rear LG Surfboard Fins","description":"\u003carticle\u003e\r\n  \u003ch2\u003eFCS II Mayhem Quad Rear Large Fin Set\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe \u003cstrong\u003eFCS II Mayhem Quad Rear Large Fin Set\u003c\/strong\u003e is designed to pair seamlessly with the FCS II Mayhem Quad Front fins, creating a high-performance quad setup that delivers exceptional speed, drive, and control. Developed in collaboration with Lost Surfboards and legendary shaper Matt \"Mayhem\" Biolos, these rear fins are tuned to maximize projection while maintaining smooth rail-to-rail transitions and excellent hold.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eProduct Specifications\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e 119160\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e FCS\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Mayhem Quad Rear\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Large\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin System:\u003c\/strong\u003e FCS II\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin Setup:\u003c\/strong\u003e Quad Rear Pair (2 Fins)\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Characteristics\u003c\/h3\u003e\r\n  \u003cp\u003eThe Mayhem Quad Rear template is engineered to provide excellent stability and drive without sacrificing the fast, free feel of a quad setup. The balanced foil and refined outline create powerful projection through turns while maintaining smooth release and exceptional control, making these fins ideal for aggressive, high-performance surfing.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cp\u003eThese rear fins perform exceptionally well in a wide range of surf, from everyday beach breaks to powerful point and reef waves. They are designed to complement modern performance shortboards and hybrid shapes ridden as quads.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eRecommended Rider\u003c\/h3\u003e\r\n  \u003cp\u003eThe \u003cstrong\u003eLarge\u003c\/strong\u003e rear template is intended to be paired with Large Mayhem Quad front fins and is recommended for surfers weighing approximately \u003cstrong\u003e175 lbs (80 kg) and above\u003c\/strong\u003e, or for powerful surfers seeking additional drive and control.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose These Fins?\u003c\/h3\u003e\r\n  \u003cp\u003eWhether you're replacing worn rear fins or completing a Mayhem quad setup, these FCS II Quad Rear fins provide the speed, hold, and responsiveness needed to get the most out of your quad-fin surfboard. Their refined design allows surfers to generate maximum speed while maintaining confidence through powerful turns.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e\r\n  \u003cp\u003eBuying from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a small, family-owned core surf shop operated by surfers passionate about sharing the love of surfing and the ocean. Our experienced team is here to help you choose the right fins and equipment so you can maximize every surf session.\u003c\/p\u003e\r\n\u003c\/article\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52587199856923,"sku":"119160","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-mayhem-driver-pc-carbon-quad-rear-lg-surfboard-fins-8502994.jpg?v=1784148426"},{"product_id":"fcs-ii-mayhem-pivot-pc-carbon-quad-rear-md-surfboard-fins","title":"FCS II Mayhem PIVOT PC Carbon Quad Rear MD Surfboard Fins","description":"\u003carticle\u003e\r\n  \u003ch2\u003eFCS II Mayhem Quad Rear Medium Fin Set\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe \u003cstrong\u003eFCS II Mayhem Quad Rear Medium Fin Set\u003c\/strong\u003e is engineered to pair perfectly with the FCS II Mayhem Quad Front fins, creating a balanced quad setup with exceptional speed, drive, and control. Developed in collaboration with Lost Surfboards and renowned shaper Matt \"Mayhem\" Biolos, these rear fins are designed to maximize projection while maintaining smooth rail-to-rail transitions and predictable release.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eProduct Specifications\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e 119164\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e FCS\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Mayhem Quad Rear\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Medium\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin System:\u003c\/strong\u003e FCS II\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin Setup:\u003c\/strong\u003e Quad Rear Pair (2 Fins)\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Characteristics\u003c\/h3\u003e\r\n  \u003cp\u003eThe Mayhem Quad Rear template provides the ideal balance of hold, projection, and release to complement the Mayhem Quad front fins. Its refined foil enhances acceleration and down-the-line speed while maintaining excellent control through powerful carves and fast directional changes.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cp\u003eThese rear fins perform exceptionally well in a wide range of conditions, from everyday beach breaks to powerful point breaks and reefs. They are designed to maximize the performance of modern quad-fin surfboards by delivering increased speed without sacrificing stability.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eRecommended Rider\u003c\/h3\u003e\r\n  \u003cp\u003eThe \u003cstrong\u003eMedium\u003c\/strong\u003e rear template is intended to be paired with Medium Mayhem Quad front fins and is recommended for surfers weighing approximately \u003cstrong\u003e145–195 lbs (65–90 kg)\u003c\/strong\u003e.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose These Fins?\u003c\/h3\u003e\r\n  \u003cp\u003eWhether you're replacing worn rear fins or completing a Mayhem quad setup, these FCS II Quad Rear fins deliver the speed, control, and responsiveness needed to unlock the full performance potential of your quad-fin surfboard.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e\r\n  \u003cp\u003eBuying from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a small, family-owned core surf shop operated by surfers passionate about sharing the love of surfing and the ocean. Our knowledgeable staff is here to help you choose the right fins and equipment so you can get the most out of every surf session.\u003c\/p\u003e\r\n\u003c\/article\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52587200348443,"sku":"119164","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-mayhem-pivot-pc-carbon-quad-rear-md-surfboard-fins-4719777.jpg?v=1784148426"},{"product_id":"fcs-ii-mayhem-pivot-pc-carbon-quad-rear-lg-surfboard-fins","title":"FCS II Mayhem PIVOT PC Carbon Quad Rear LG Surfboard Fins","description":"\u003carticle\u003e\r\n  \u003ch2\u003eFCS II Mayhem Quad Rear Large Fin Set\u003c\/h2\u003e\r\n\r\n  \u003cp\u003eThe \u003cstrong\u003eFCS II Mayhem Quad Rear Large Fin Set\u003c\/strong\u003e is designed to pair with the FCS II Mayhem Quad Front fins, creating a balanced, high-performance quad setup with exceptional speed, drive, and control. Developed in collaboration with Lost Surfboards and renowned shaper Matt \"Mayhem\" Biolos, these rear fins are engineered to maximize projection while maintaining smooth rail-to-rail transitions and confident hold through powerful turns.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eProduct Specifications\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e 119165\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e FCS\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Mayhem Quad Rear\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e Large\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin System:\u003c\/strong\u003e FCS II\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin Setup:\u003c\/strong\u003e Quad Rear Pair (2 Fins)\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch3\u003ePerformance Characteristics\u003c\/h3\u003e\r\n  \u003cp\u003eThe Mayhem Quad Rear template is tuned to complement the Mayhem Quad front fins by adding stability, drive, and control without sacrificing the speed and freedom that quad setups are known for. Its refined foil enhances acceleration, maintains hold through committed turns, and provides smooth release when transitioning between maneuvers.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal Conditions\u003c\/h3\u003e\r\n  \u003cp\u003eThese rear fins perform exceptionally well in everything from everyday beach breaks to powerful point breaks and reefs. They are ideal for modern performance shortboards and hybrid shapes ridden as quads, offering maximum down-the-line speed with excellent control.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eRecommended Rider\u003c\/h3\u003e\r\n  \u003cp\u003eThe \u003cstrong\u003eLarge\u003c\/strong\u003e rear template is intended to be paired with Large Mayhem Quad front fins and is recommended for surfers weighing approximately \u003cstrong\u003e175 lbs (80 kg) and above\u003c\/strong\u003e, or for powerful surfers seeking additional drive and stability.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose These Fins?\u003c\/h3\u003e\r\n  \u003cp\u003eWhether you're replacing worn rear fins or completing a Mayhem quad setup, the FCS II Mayhem Quad Rear Large fins deliver the speed, hold, and responsiveness needed to unlock the full performance potential of your quad-fin surfboard.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhy Choose Rider Shack?\u003c\/h3\u003e\r\n  \u003cp\u003eBuying from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a small, family-owned core surf shop operated by surfers passionate about sharing the love of surfing and the ocean. Our knowledgeable staff is here to help you choose the right fins and equipment so you can get the most out of every surf session.\u003c\/p\u003e\r\n\u003c\/article\u003e","brand":"FCS","offers":[{"title":"Default Title","offer_id":52587200479515,"sku":"119165","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-mayhem-pivot-pc-carbon-quad-rear-lg-surfboard-fins-1393133.jpg?v=1784148426"},{"product_id":"fcs-ii-mid-carver-2-1-xl-clear-surfboard-fin-set","title":"FCS II Mid Carver 2+1 XL Clear Surfboard Fin Set","description":"Clean and understated in appearance, yet modest in reliability and performance. Solid fiberglass material combined with two proven templates. This set just works and allows you to trim, turn and feel the smooth groove on any midlength.","brand":"FCS","offers":[{"title":"Default Title","offer_id":53871962751259,"sku":"119408","price":155.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-mid-carver-21-xl-clear-surfboard-fin-set-9959867.jpg?v=1788534979"},{"product_id":"true-ames-lovelace-side-bites-futures","title":"True Ames Lovelace Side Bites Futures","description":"\u003carticle\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003eTrue Ames Lovelace Sidebite Fins\u003c\/strong\u003e are a two-fin set designed by Ryan Lovelace for surfers who want subtle extra hold and drive from a 2+1 setup without overpowering the center fin. Built to work especially well in longer boards, minigliders, and more performance-oriented 2+1 configurations, these sidebites are intentionally small and supportive—adding bite and down-the-line speed while letting the center fin remain the main influence on the board's feel.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eDesigned to Support, Not Dominate\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    Ryan Lovelace designed these sidebites for 2+1 setups where the center fin should do most of the work. Rather than creating a heavily finned or overly spread-out feel, the Lovelace Sidebites are meant to stay clustered and subtle, adding just enough support to improve hold and drive without taking over the ride.\r\n  \u003c\/p\u003e\r\n\r\n  \u003cp\u003e\r\n    They are a particularly good match for surfers who prefer a slightly more parallel 2+1 setup, an under-finned feel, or a smaller performance sidebite option on longer boards.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003e2-fin set:\u003c\/strong\u003e Designed specifically as sidebites for 2+1 surfboard setups.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFutures compatible:\u003c\/strong\u003e Fits Futures side fin boxes.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eCompact template:\u003c\/strong\u003e Adds support without overpowering the center fin.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eDown-the-line drive:\u003c\/strong\u003e Helps add speed and bite through turns and longer sections.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eClustered setup feel:\u003c\/strong\u003e Designed to work closer to the center fin rather than as a wide, spread-out performance 2+1.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003e5° cant:\u003c\/strong\u003e Provides a balanced blend of hold and response.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFlat inside foil:\u003c\/strong\u003e Creates predictable, controlled performance.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eSolid fiberglass construction:\u003c\/strong\u003e Durable, responsive feel with minimal unwanted flex.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eRaw sanded finish:\u003c\/strong\u003e Clean, functional finish with a classic fiberglass look.\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eTrue Ames Lovelace Sidebite Fin Specs\u003c\/h2\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eHeight:\u003c\/strong\u003e 3.46\" \/ 88 mm\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eBase:\u003c\/strong\u003e 3.01\" \/ 76 mm\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eArea:\u003c\/strong\u003e 8.02 sq. in. \/ 51.74 cm²\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eCant:\u003c\/strong\u003e 5°\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFoil:\u003c\/strong\u003e Flat inside foil\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Solid fiberglass\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Raw sanded\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Futures\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eBest for 2+1 Mid-Lengths, Minigliders, and Longer Boards\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    These fins are especially well suited to boards where you want the center fin to define the ride while the sidebites provide a little extra security. They work well on \u003cstrong\u003emid-lengths, minigliders, and longer boards\u003c\/strong\u003e that benefit from added drive and hold without moving into a heavily finned setup.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eIdeal For\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e2+1 mid-lengths\u003c\/li\u003e\r\n    \u003cli\u003eMinigliders\u003c\/li\u003e\r\n    \u003cli\u003eLonger performance boards\u003c\/li\u003e\r\n    \u003cli\u003eSurfers who prefer a more under-finned feel\u003c\/li\u003e\r\n    \u003cli\u003eRiders who want the center fin to remain the dominant part of the setup\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eHow They Change the Ride\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    The Lovelace Sidebites are designed to add \u003cstrong\u003ea little extra bite, support, and down-the-line drive\u003c\/strong\u003e while keeping the overall setup loose and center-fin focused. Compared with larger side fins, they create less resistance and allow more of the board's personality to come from the center fin.\r\n  \u003c\/p\u003e\r\n\r\n  \u003cp\u003e\r\n    If your current 2+1 feels too stiff or over-finned, these smaller sidebites can be a great way to free the board up without giving up all of the added hold that side fins provide.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eRider Shack Note\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    Buying your True Ames Lovelace Sidebite Fins from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a \u003cstrong\u003esmall business\u003c\/strong\u003e and a\r\n    \u003cstrong\u003ecore surf shop run by surfers\u003c\/strong\u003e. Thanks for supporting independent surf retail and quality surf equipment designed by people who understand how boards actually feel in the water.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eFAQ: True Ames Lovelace Sidebite Fins\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eWhat type of setup are the Lovelace Sidebites designed for?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    They are designed for \u003cstrong\u003e2+1 setups\u003c\/strong\u003e, where a larger center fin does most of the work and the sidebites provide additional hold and drive.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eAre these fins Futures compatible?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    Yes. The Lovelace Sidebites are \u003cstrong\u003eFutures compatible\u003c\/strong\u003e and fit Futures side fin boxes.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eAre these sidebites smaller than a typical performance 2+1 fin?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    Yes. They are intentionally compact, making them a good choice for surfers who want a more subtle side-fin influence and a setup that stays centered around the main fin.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat kind of boards work best with these fins?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    They work especially well on \u003cstrong\u003emid-lengths, minigliders, and longer boards\u003c\/strong\u003e, particularly boards designed around a looser or more center-fin-dominant 2+1 setup.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat does a 5° cant do?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003e5° cant\u003c\/strong\u003e provides a balanced amount of outward angle, helping the fins add hold and response without making the board feel overly stiff or locked in.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat is the benefit of a flat inside foil?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    A \u003cstrong\u003eflat inside foil\u003c\/strong\u003e creates a predictable, controlled feel and is a common choice for side fins designed to add reliable support and bite.\r\n  \u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"True Ames","offers":[{"title":"Royal Blue","offer_id":53945779355931,"sku":"119468|Royal Blue","price":65.0,"currency_code":"USD","in_stock":true},{"title":"Smoke","offer_id":53945779454235,"sku":"119468|Smoke","price":65.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/true-ames-lovelace-side-bites-futures-1071738.jpg?v=1789487253"},{"product_id":"fcs-ii-ci-upright-quad-rear-white","title":"FCS II CI Upright Quad Rear White","description":"\u003carticle\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003eFCS II CI Upright Quad Rear Fin Set - Medium\u003c\/strong\u003e is designed for surfers who want more control, stability, and tight pivot-style turning from their quad setup. Developed by \u003cstrong\u003eBritt Merrick\u003c\/strong\u003e to pair with the upright Channel Islands side fins, these quad rears use a \u003cstrong\u003eneutral-raked template\u003c\/strong\u003e and \u003cstrong\u003e50\/50 foil\u003c\/strong\u003e to create a balanced, confidence-inspiring feel without sacrificing responsiveness.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eDesigned to Complete the CI Upright Quad Setup\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    These rear fins are specifically shaped to complement the \u003cstrong\u003eCI Upright side fins\u003c\/strong\u003e, making them a strong choice for surfers who want to fine-tune a performance quad. The neutral rake helps keep the board stable and controlled while still allowing it to pivot quickly through tighter turns.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eQuad rear fin set:\u003c\/strong\u003e Includes 2 rear fins.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eDesigned by Britt Merrick:\u003c\/strong\u003e Developed in collaboration with Channel Islands Surfboards.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eNeutral-raked template:\u003c\/strong\u003e Balances control and stability with quick pivoting response.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003e50\/50 foil:\u003c\/strong\u003e Adds directional control and a smooth, predictable feel.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003ePerformance Core construction:\u003c\/strong\u003e Lightweight material with progressive flex from base to tip.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFCS II compatible:\u003c\/strong\u003e Designed for the FCS II fin system.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eMedium size:\u003c\/strong\u003e Recommended by FCS for surfers approximately 145-175 lbs.\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003ePerformance Core Construction\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    FCS builds the CI Upright Quad Rears in \u003cstrong\u003ePerformance Core\u003c\/strong\u003e, a lightweight multi-layer resin construction designed to provide a progressive flex pattern from the base through the tip. This helps the fins maintain drive and hold through turns while keeping the ride responsive and controlled.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eBest for Punchy, Steep Surf\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    The CI Upright template is particularly well suited to \u003cstrong\u003ehollow, steep waves and punchy beach breaks\u003c\/strong\u003e, where quick acceleration and tight turning are valuable. It also works well on performance and hybrid boards with more relaxed rocker that benefit from extra start-up speed and a responsive pivot feel.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eWho Is This Fin Set Best For?\u003c\/h2\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eSurfers running a \u003cstrong\u003equad setup\u003c\/strong\u003e with CI Upright side fins\u003c\/li\u003e\r\n    \u003cli\u003eRiders who want \u003cstrong\u003etight, pivot-style turns\u003c\/strong\u003e\n\u003c\/li\u003e\r\n    \u003cli\u003ePerformance and hybrid boards with relaxed rocker\u003c\/li\u003e\r\n    \u003cli\u003eSurfers looking for a balanced mix of control, stability, and speed\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eRider Shack Note\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    Buying your FCS II CI Upright Quad Rear Fin Set from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a \u003cstrong\u003esmall business and core surf shop run by surfers\u003c\/strong\u003e. We're here to help you match your fins to your board and the type of waves you actually surf.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eFAQ: FCS II CI Upright Quad Rear Fin Set - Medium\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eHow many fins are included in this set?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    This is a \u003cstrong\u003e2-fin quad rear set\u003c\/strong\u003e, designed to be paired with compatible front quad fins.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat fin system does this set use?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    These fins are designed for the \u003cstrong\u003eFCS II fin system\u003c\/strong\u003e.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat size surfer is the Medium set recommended for?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    FCS recommends the \u003cstrong\u003eMedium\u003c\/strong\u003e size for surfers approximately \u003cstrong\u003e145-175 lbs\u003c\/strong\u003e.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat kind of waves are these fins best for?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    They are especially well suited to \u003cstrong\u003ehollow, steep waves and punchy beach breaks\u003c\/strong\u003e, where quick speed and tight turning are important.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat does the 50\/50 foil do?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003e50\/50 foil\u003c\/strong\u003e helps provide stability and directional control, giving the rear fins a balanced and predictable feel through turns.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eDo these fins work best with CI Upright side fins?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    Yes. They were specifically designed to pair with \u003cstrong\u003eChannel Islands CI Upright side fins\u003c\/strong\u003e for a balanced quad setup.\r\n  \u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":53958258360603,"sku":"119480","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-ci-upright-quad-rear-white-5055269.jpg?v=1789663891"},{"product_id":"fcs-ii-ci-upright-quad-rear-white-large","title":"FCS II CI Upright Quad Rear White Large","description":"\u003carticle\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003eFCS II CI Upright Quad Rear Fin Set - Large\u003c\/strong\u003e is designed for surfers who want more control, stability, and tight pivot-style turning from their quad setup. Developed by \u003cstrong\u003eBritt Merrick\u003c\/strong\u003e to pair with the upright Channel Islands side fins, these quad rears use a \u003cstrong\u003eneutral-raked template\u003c\/strong\u003e and \u003cstrong\u003e50\/50 foil\u003c\/strong\u003e to create a balanced, confidence-inspiring feel without sacrificing responsiveness.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eDesigned to Complete the CI Upright Quad Setup\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    These rear fins are specifically shaped to complement the \u003cstrong\u003eCI Upright side fins\u003c\/strong\u003e, making them a strong choice for surfers who want to fine-tune a performance quad. The neutral rake helps keep the board stable and controlled while still allowing it to pivot quickly through tighter turns.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eQuad rear fin set:\u003c\/strong\u003e Includes 2 rear fins.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eDesigned by Britt Merrick:\u003c\/strong\u003e Developed in collaboration with Channel Islands Surfboards.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eNeutral-raked template:\u003c\/strong\u003e Balances control and stability with quick pivoting response.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003e50\/50 foil:\u003c\/strong\u003e Adds directional control and a smooth, predictable feel.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003ePerformance Core construction:\u003c\/strong\u003e Lightweight material with progressive flex from base to tip.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFCS II compatible:\u003c\/strong\u003e Designed for the FCS II fin system.\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eLarge size:\u003c\/strong\u003e Best suited to larger or more powerful surfers who want added hold and control.\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003ePerformance Core Construction\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    FCS builds the CI Upright Quad Rears in \u003cstrong\u003ePerformance Core\u003c\/strong\u003e, a lightweight multi-layer resin construction designed to provide a progressive flex pattern from the base through the tip. This helps the fins maintain drive and hold through turns while keeping the ride responsive and controlled.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eBest for Punchy, Steep Surf\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    The CI Upright template is particularly well suited to \u003cstrong\u003ehollow, steep waves and punchy beach breaks\u003c\/strong\u003e, where quick acceleration and tight turning are valuable. It also works well on performance and hybrid boards with more relaxed rocker that benefit from extra start-up speed and a responsive pivot feel.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eWho Is This Fin Set Best For?\u003c\/h2\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003eSurfers running a \u003cstrong\u003equad setup\u003c\/strong\u003e with CI Upright side fins\u003c\/li\u003e\r\n    \u003cli\u003eLarger or more powerful surfers who want \u003cstrong\u003eextra hold and stability\u003c\/strong\u003e\n\u003c\/li\u003e\r\n    \u003cli\u003eRiders who prefer \u003cstrong\u003etight, pivot-style turns\u003c\/strong\u003e\n\u003c\/li\u003e\r\n    \u003cli\u003ePerformance and hybrid boards with relaxed rocker\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eRider Shack Note\u003c\/h2\u003e\r\n  \u003cp\u003e\r\n    Buying your FCS II CI Upright Quad Rear Fin Set from \u003cstrong\u003eRider Shack\u003c\/strong\u003e supports a \u003cstrong\u003esmall business and core surf shop run by surfers\u003c\/strong\u003e. We're here to help you match your fins to your board and the type of waves you actually surf.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch2\u003eFAQ: FCS II CI Upright Quad Rear Fin Set - Large\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eHow many fins are included in this set?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    This is a \u003cstrong\u003e2-fin quad rear set\u003c\/strong\u003e, designed to be paired with compatible front quad fins.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat fin system does this set use?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    These fins are designed for the \u003cstrong\u003eFCS II fin system\u003c\/strong\u003e.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWho should choose the Large size?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003eLarge\u003c\/strong\u003e size is best suited to larger or more powerful surfers who want additional hold, drive, and stability from their quad setup.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat kind of waves are these fins best for?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    They are especially well suited to \u003cstrong\u003ehollow, steep waves and punchy beach breaks\u003c\/strong\u003e, where quick speed and tight turning are important.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat does the 50\/50 foil do?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    The \u003cstrong\u003e50\/50 foil\u003c\/strong\u003e helps provide stability and directional control, giving the rear fins a balanced and predictable feel through turns.\r\n  \u003c\/p\u003e\r\n\r\n  \u003ch3\u003eDo these fins work best with CI Upright side fins?\u003c\/h3\u003e\r\n  \u003cp\u003e\r\n    Yes. They were specifically designed to pair with \u003cstrong\u003eChannel Islands CI Upright side fins\u003c\/strong\u003e for a balanced quad setup.\r\n  \u003c\/p\u003e\r\n\u003c\/article\u003e\r\n","brand":"FCS","offers":[{"title":"Default Title","offer_id":53958395199771,"sku":"119481","price":83.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/fcs-ii-ci-upright-quad-rear-white-large-3076201.jpg?v=1789663891"},{"product_id":"roam-fcs-side-bite-fin-set","title":"Roam FCS Side Bite Fin Set","description":"\u003carticle\u003e\r\n  \u003cp\u003eThe Roam FCS Side Bite Fin Set is designed to add drive and stability to single-fin surfboards running a 2+1 setup. With a wide base and a relatively neutral tip, these compact side fins add support and control while allowing the center fin to remain the dominant part of the setup. They are a practical choice for compatible longboards and mid-lengths.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eRoam FCS Side Bite Fin Specs\u003c\/h2\u003e\r\n  \u003cul\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Roam\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Surfboard Side Bite Fins\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin Size:\u003c\/strong\u003e 3.57\"\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin System:\u003c\/strong\u003e FCS Two-Tab\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eFin Setup:\u003c\/strong\u003e Side Bites\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e 2+1 Longboards and Mid-Lengths\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\r\n    \u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e 119539\u003c\/li\u003e\r\n  \u003c\/ul\u003e\r\n\r\n  \u003ch2\u003eDesigned for 2+1 Surfboards\u003c\/h2\u003e\r\n  \u003cp\u003eSide bites are the two smaller side fins used alongside a larger center fin in a 2+1 configuration. Roam designed these fins to add drive and stability to single-fin setups, making them well suited to longboards and mid-lengths equipped with compatible side-fin boxes.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eAdding side bites can give a single-fin-based board additional support through turns while retaining the center fin as the primary fin in the setup.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eWide Base for Drive and Stability\u003c\/h2\u003e\r\n  \u003cp\u003eRoam gives its Side Bite a wide base with a fairly neutral tip. The wider base is designed to provide additional drive and stability, helping the board feel more engaged when pressure is applied through a turn.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eThe compact side-bite size allows the fins to complement rather than replace the larger center fin, making them useful for surfers who want to tune the feel of a 2+1 setup.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003e3.57\" Side Bite Template\u003c\/h2\u003e\r\n  \u003cp\u003eRoam currently lists its standard Side Bite at 3.57\". This compact template is specifically designed for use as a side fin rather than as a full-size thruster fin.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eFCS Two-Tab Compatibility\u003c\/h2\u003e\r\n  \u003cp\u003eThis version uses Roam's FCS two-tab base. Roam's two-tab FCS fins are designed for the original FCS-style system and can also be used in compatible FCS II boxes when secured with the appropriate optional screws.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eCheck the fin boxes on your surfboard before purchasing to make sure this is the correct version for your board.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eLongboard and Mid-Length Fin Tuning\u003c\/h2\u003e\r\n  \u003cp\u003eChanging the side bites is one way to fine-tune how a 2+1 surfboard feels without replacing the center fin. Side fins contribute additional hold and drive from the rail, which can be useful when a pure single-fin setup feels too free or when the surfer wants additional support through turns.\u003c\/p\u003e\r\n\r\n  \u003cp\u003eBecause the overall feel of a 2+1 setup also depends heavily on the center fin, center-fin size, placement, board design, and wave conditions should all be considered when choosing a complete setup.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\r\n\r\n  \u003ch3\u003eHow large are the Roam Side Bite fins?\u003c\/h3\u003e\r\n  \u003cp\u003eRoam lists its standard Side Bite fins at 3.57\".\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat are side bite fins used for?\u003c\/h3\u003e\r\n  \u003cp\u003eSide bites are small side fins typically paired with a larger center fin to create a 2+1 setup on longboards and mid-length surfboards.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eWhat do the Roam Side Bites add to a surfboard?\u003c\/h3\u003e\r\n  \u003cp\u003eRoam designed these side bites to add drive and stability to a single-fin-based setup.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eDo these fins fit FCS boxes?\u003c\/h3\u003e\r\n  \u003cp\u003eYes. This version uses Roam's FCS two-tab base. Roam also states that its FCS two-tab fins can be used in FCS II boxes when secured with the appropriate optional screws.\u003c\/p\u003e\r\n\r\n  \u003ch3\u003eAre these a replacement for a longboard center fin?\u003c\/h3\u003e\r\n  \u003cp\u003eNo. These are side bite fins intended to complement a larger center fin in a 2+1 setup. A center fin is selected separately unless specifically stated otherwise.\u003c\/p\u003e\r\n\r\n  \u003ch2\u003eShop Surfboard Fins at Rider Shack\u003c\/h2\u003e\r\n  \u003cp\u003eBuying from Rider Shack supports a small, family-owned core surf shop operated by surfers passionate about sharing the love of surfing and the ocean. Whether you're replacing a fin or dialing in a different setup, we're here to help you find compatible surfboard equipment for the way you surf.\u003c\/p\u003e\r\n\u003c\/article\u003e","brand":"Roam","offers":[{"title":"Smoke \/ MD","offer_id":54065990500635,"sku":"119539|Smoke|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Black \/ MD","offer_id":54065991024923,"sku":"119539|Black|MD","price":57.0,"currency_code":"USD","in_stock":true},{"title":"Clear \/ MD","offer_id":54065991057691,"sku":"119539|Clear|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Ice Blue \/ MD","offer_id":54065991090459,"sku":"119539|Ice Blue|MD","price":57.0,"currency_code":"USD","in_stock":false},{"title":"Burgundy \/ MD","offer_id":54065991123227,"sku":"119539|Burgundy|MD","price":57.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6868\/9435\/files\/roam-fcs-side-bite-fin-set-3773011.jpg?v=1791278965"}],"url":"https:\/\/www.ridershack.com\/collections\/side-quad-rear-fins.oembed?page=2","provider":"Rider Shack","version":"1.0","type":"link"}