The Firewire KSR Rake Thruster Fins Large are a high-rake, high-drive performance fin designed for surfers who want maximum hold and speed projection in powerful, overhead surf — built to complement Firewire's performance shortboard lineup.

Key Features:

• High-Rake Template — swept-back foil positions the fin tip further back for increased hold through rail turns and better speed projection down the line; well-suited for fast, hollow, or powerful waves
• Large Size — bigger fin area delivers more drive and control; sized for surfers 170–200+ lbs or for surfers who want maximum hold in steep or heavy surf
• Thruster Setup — sold as a set of 3 (two side fins + one center fin) for a standard thruster configuration; provides the drive, hold, and directional stability surfers need in overhead+ conditions
• Firewire KSR Design — shape developed in collaboration with Firewire's team surfers to match the performance characteristics of Firewire's high-performance EPS/epoxy boards, which respond differently to fin input than traditional PU boards
• Futures Fin System — compatible with Futures fin boxes for secure, tool-free install

High-rake fins like the KSR generate speed from the fin itself rather than relying on constant rider input — the swept template stores energy through turns and releases it as the board exits. In the Large size, they suit surfers who charge overhead and above and want a fin that holds its line when things get critical. Pair them with Firewire's performance shortboards for a matched system or use them in any Futures-compatible board that benefits from more drive and hold.

Sizing Guide: Large is recommended for surfers approximately 170–200+ lbs. For lighter surfers or softer wave conditions, consider the Medium size for more pivot and release.

Compatibility: Futures fin system only. Sold as a 3-fin thruster set.