Ramp 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 140-180mm Travel A2 Pike forks with "Boost" 15x110 axle spacing, all B1 and newer Pike forks.Fits 140-180mm 35mm Revelation140-180mm A1 and newer Yari and all RCT3 and RC A1 and newer Lyrik (regardless of axle spacing).Easy installation with no lower-leg removalWill not Work on Dual Position Air ForksAdds speed-sensitive ending-stroke control and bottom-out force adjustabilityIsolate and tune bottom-out with minimal changes to initial and mid-strokeEasily change tune for different trails without tools MRP Ramp Control Cartridge Air Springs & Parts UPC: 702430169806