Road Riser Spacers Alloy Bar Plate Rising Spacer Clamp Aluminum For TT Handlebar Parts 31.8mm 10/20mm "REDUCE DRIVING FATIGUE: The motorcycle seat clamp is on the basis of the clamp, the front and back can be rotated to adjust Relieve neck, and shoulder fatigue during long rides." 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.