This shimano rs81 c50 carbon laminate clincher rear wheel is a high performance road racing wheels meets the demands of todays professional and amateur riders the 50 mm deep 224 mm wide d2 carbon rim with alloy braking surface for improved aerodynamics and increased rigidity for sprinters and tt specialists this wheel is both light weight and rigid whilst maintaining high braking performance with standard brake pads the cold forged and machined hub has polished bearing races to reduce fr