FOX IFP-R V-Twin rear shocks have an internal floating piston to separate the nitrogen gas from the shock oil, maintaining damping control no matter how long you ride. Twelve distinct clicks of our wide-range internal rebound control allow you to fine tune the rebound rate to balance out your spring preload, keeping your rear wheel firmly planted on the road. Our vehicle-specific damping and linear spring rates gives you a confident connection to the road while soaking up the bumps mile after mile, a key component of the FOX rebound adjustable design.