Shimano rs81 c50 carbon road wheelsethigh performance road racing wheel meets the demands of todays professional and amateur riders featurescarbon and alloy clincher rim is both light weight and rigid whilst maintaining high braking performance with standard brake pads22 4mm wide d2 carbon rim with alloy braking surface for improved aerodynamics and increased rigidity for sprinters and tt specialists21 rear and 16 front stainless steel butted and bladed straight pull spokes for optimal bala