Our 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. Looking for comfort and control whether you're riding solo or two-up? Twelve distinct clicks of our wide-range internal rebound control allow you to tune the exact rebound rate to balance out your spring preload, keeping your rear wheel firmly planted on the road. Adjustable rebound is extremely beneficial when your Sportster's ideal spring preload requires either a very soft or very firm setting, or if you have large ride load changes you want address. 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.