Universal 22mm 25mm 28mm Handlebar Risers Extension Back Moved Riser "Easy installation: No drilling or welding is required, and the compact size enhances the appearance of the motorcycle. which can cope with heavy rain, muddy roads and other extreme driving conditions" 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.