Shimano rs81 c50 carbon rear wheelhigh performance road racing wheel meets the demands of todays professional and amateur riders features carbon and alloy clincher rim is both light weight and rigid whilst maintaining high braking performance with standard brake pads 50mm deep 22 4mm wide d2 carbon rim with alloy braking surface for improved aerodynamics and increased rigidity for sprinters and tt specialists 21 rear stainless steel butted and bladed straight pull spokes for optimal balance