The Channel Islands CI Upright Tri-Quad Large Fin Set is built for surfers looking for quick acceleration, tight turns, and the versatility to switch between thruster and quad setups. Designed by Channel Islands around a more upright template, these fins favor fast transitions and responsive surfing while maintaining enough drive and control to push hard through turns.
Channel Islands CI Upright Tri-Quad Large Fin Set
- Brand: Channel Islands
- Model: CI Upright Tri-Quad
- Size: Large
- Fin System: Futures
- Fin Setup: Tri-Quad / 5 Fin
- Recommended Rider Weight: 165–200 lbs
- Condition: New
- Item Number: 119471
Upright Template for Quick Direction Changes
The CI Upright was developed to maintain response and turning performance on surfboards with flatter, more relaxed rocker. Its upright profile favors tighter turning arcs and quick transitions, making it a strong option for surfers who want to stay active in the pocket.
Channel Islands also points to the template's ability to generate quick start-up drive and acceleration while maintaining a loose, responsive feel off the top.
Thruster and Quad Versatility
The five-fin Tri-Quad set gives you two distinct setup options without needing separate fin sets. Run the three larger fins as a thruster when you want a familiar combination of control, precision, and release, or install the two side fins with the quad rears when you want the speed and hold of a quad setup.
Large CI Upright Fin Specifications
Large Side and Center Fins
- Base: 4.50"
- Depth: 4.70"
- Area: 15.79 sq. in.
- Sweep: 30.3°
- Foil: Flat
Large Quad Rear Fins
- Base: 4.14"
- Depth: 4.27"
- Area: 12.29 sq. in.
- Sweep: 33.3°
Who Should Ride the Large CI Upright?
Channel Islands recommends the Large size for surfers approximately 165 to 200 pounds. Rider weight is a useful starting point when choosing fins, but the best size can also depend on the surfboard, wave conditions, and how much hold or release you prefer.
Where the CI Upright Works
The upright template is particularly suited to surfing where fast transitions and tighter turns are important. Channel Islands highlights punchy, hollow waves and vertical surfing, while also recommending the design when immediate acceleration off the takeoff is useful.
The template was originally developed as the Channel Islands range expanded further into hybrid and step-down surfboards with flatter rocker, but CI team riders have also used it on high-performance shortboards and step-ups when looking for reduced resistance and responsive pocket surfing.
Futures Fin Compatibility
This Rider Shack inventory item is configured for the Futures fin system. Make sure your surfboard has compatible Futures single-tab fin boxes and a five-fin box configuration if you plan to alternate between thruster and quad setups.
Frequently Asked Questions
Is the CI Upright Tri-Quad a five-fin set?
Yes. The Tri-Quad configuration provides the fins needed to run either a thruster or quad setup.
What size surfer is the Large CI Upright designed for?
Channel Islands recommends the Large size for surfers approximately 165 to 200 pounds.
What does an upright fin template do?
The CI Upright's reduced sweep promotes tighter turning arcs, quick direction changes, and responsive pocket surfing while its full profile provides enough area to push through turns.
Can I ride these fins as a thruster?
Yes. The set is designed to provide both thruster and quad configurations.
What fin system does this set fit?
This Rider Shack item is listed for Futures fin boxes.
Shop Surfboard Fins at Rider Shack
Buying from Rider Shack supports a small, family-owned core surf shop operated by surfers who are passionate about sharing the love of surfing and the ocean. We're here to help surfers match their boards with fins and equipment that make sense for their surfing and the performance they're looking for.
