VideoPUP(TM) New Upgrade Replacement Rear Shock for Honda XR50 CRF50 50cc 70cc 90cc 110cc 125cc and Pit Dirt Bike Aftermarket air-filled rear shock absorber to fit most 50cc~110cc motorcycle,Dirt Bike,Pit Bike Mounting Hole Diameter: 10mm Excellent piston rod with progressive rate spring preload(non-adjustable) With rubber+metal bushing on both mounting hole Improve driving comfort and motorcycle handling