Rizoma aluminum handlebars. Rizomas aluminum handlebars make a noted ergonomic improvement to most motorcycles that have a cramped ride. Lighter weight, improved geometry, give the rider more comfort. This translates into better control, more solid feel and better turn in. HANDLEBAR DIAMETER 22 mm. Weight. .46 Kg  A fundamental component in terms of the synergy between man and machine, handlebars also make a decisive contribution to the overall statement of a motorcycle. RiZOMA offers a wide range of handlebars with various positioning options to suite a range of riding styles, all in a vast choice of colors.