MRP Ramp Control Cartridge Version F for Fox 36 Float, 2018 to Present Forks with FIT 4, RC2 and Grip DampersRamp control adds speed sensitive ending stroke bottom out adjustability to forks. At high shaft speeds, the cartridge it mimics the addition of volume reducing spacers in the fork. At low shaft speeds it allows the fork to be more active. Fits 2018 and newer 140 180mm Travel 36 Float NA2 Forks with FIT 4, RC2 and GRIP dampers Will not work on 2015 17 36 NA forks with Air transfer Shaft. Use Ramp Control Version D for these forks. Easy installation