Risers with offset- Handlebar risers 30 mm with offset 21 mm for handlebars with Ø 25,4 mm fixing screws 4. You buy new goods directly from the manufacturer. The following vehicle manufacturers have models where this handlebar riser can be used: BMW, Harley, Honda, Kawasaki, Triumph, Yamaha and many more Handlebar risers 30 mm with offset 21 mm for handlebars with Ø 25,4 mm fixing screws 4.