Oxford Motorcycle Handlebar Risers The Oxford motorcycle handlebar risers are perfect for providing a more relaxed riding position. Constructed with CNC aluminium alloy, the motorbike handlebar risers are built with genuine quality and will stand the test of time. Easily raise your motorbike handlebars by 20mm for a relaxing seated position today. Motorcycle Handlebar Riser Features: CNC aluminium alloy construction. Fits 22mm handlebars with a 28.6mm diameter at the clamp section. Raises handlebars 20mm for a more relaxed seated position. Size: 20mm x 28.6mm ⌀. Included: 2 x bar risers, 4 x M8 bolts (thread pitch 1.25mm, length 45mm).