22mm 28mm Motorcycle Handlebar Riser Mount Adapter Kit Extender Riding "so that the rider has a more comfortable riding posture, effectively reduce the fatigue of long-distance riding. Good control and stability at high speeds Ensure safety while driving." Motorbike Handlebar Risers is A safe and reliable way to fit a narrower bar to a wider stem. Simply place one shim each side of clamp area on handlebar and insert into stem, tighten as normal.