FCS II CI PC Reactor Quad Rear Fins
Britt Merrick's CI Upright quad rears, in Performance Core.
They're shaped to run behind the upright CI side fins, so the CI Upright tri set plus these gives you a quad built for speed and tight turns. The neutral rake keeps things controlled and stable, but there's still enough pivot to snap it around in a tight spot, and the 80/20 foil gives you direction and confidence when you're setting a line. PC keeps them light, and the flex runs progressively from the base out to the tip.
The template comes alive in steep, hollow waves and punchy beachies like D-Bah and North Narrabeen, but it also gives you start-up speed on the days you need help getting going. FCS made them for CI's performance and hybrid boards with relaxed rocker. Suits boards like the Bobby Quad, Neck Beard 3 Spine Tek and Better Everyday by Channel Islands.
Two more fins, two fewer excuses.
Key features
- CI Upright template: a Channel Islands collab, designed for speed and tight turns.
- Neutral rake: control and stability, with room for tight pivot turns.
- 80/20 foil: steadies the board and sharpens directional control.
- Performance Core (PC): resin-moulded and light, with a flex that keeps your drive through a turn.
Specs
- Fin system: FCS II
- Set: quad rears (2 fins)
- Construction: Performance Core (PC)
- Medium (65–80kg): base 4.04", depth 4.17", area 11.70 sq in, sweep 33.3°, 80/20 foil
- Large (75–90kg): base 4.14", depth 4.27", area 12.29 sq in, sweep 33.3°, 80/20 foil
- Colour: Black/Flame or White/Flame
If you're comparing
- CI Solution PC Quad Rear: the same CI Upright-based template, made to pair with the Solution side fins.
- Reactor PC Quad Rear: FCS's core Reactor rears, upright and quick in hollow beachies.
- Carver PC Quad Rear: more sweep, for drawn-out turns on open walls.
Complete your setup: the CI PC Upright Tri set gives you the side fins these were made for.
Not sure what to get? Get expert advice in-store or online via live chat.
Britt Merrick's CI Upright quad rears, in Performance Core.
They're shaped to run behind the upright CI side fins, so the CI Upright tri set plus these gives you a quad built for speed and tight turns. The neutral rake keeps things controlled and stable, but there's still enough pivot to snap it around in a tight spot, and the 80/20 foil gives you direction and confidence when you're setting a line. PC keeps them light, and the flex runs progressively from the base out to the tip.
The template comes alive in steep, hollow waves and punchy beachies like D-Bah and North Narrabeen, but it also gives you start-up speed on the days you need help getting going. FCS made them for CI's performance and hybrid boards with relaxed rocker. Suits boards like the Bobby Quad, Neck Beard 3 Spine Tek and Better Everyday by Channel Islands.
Two more fins, two fewer excuses.
Key features
- CI Upright template: a Channel Islands collab, designed for speed and tight turns.
- Neutral rake: control and stability, with room for tight pivot turns.
- 80/20 foil: steadies the board and sharpens directional control.
- Performance Core (PC): resin-moulded and light, with a flex that keeps your drive through a turn.
Specs
- Fin system: FCS II
- Set: quad rears (2 fins)
- Construction: Performance Core (PC)
- Medium (65–80kg): base 4.04", depth 4.17", area 11.70 sq in, sweep 33.3°, 80/20 foil
- Large (75–90kg): base 4.14", depth 4.27", area 12.29 sq in, sweep 33.3°, 80/20 foil
- Colour: Black/Flame or White/Flame
If you're comparing
- CI Solution PC Quad Rear: the same CI Upright-based template, made to pair with the Solution side fins.
- Reactor PC Quad Rear: FCS's core Reactor rears, upright and quick in hollow beachies.
- Carver PC Quad Rear: more sweep, for drawn-out turns on open walls.
Complete your setup: the CI PC Upright Tri set gives you the side fins these were made for.
Not sure what to get? Get expert advice in-store or online via live chat.

