The shimano rs81 c24 carbon laminate clincher wheelset is a high performance road racing wheels meets the demands of todays professional and amateur riders with a 21 mm front and 23mm rear deep carbon and alloy clincher rim is both light weight and rigid whilst maintaining high braking performance with standard brake pads with 16 front and 20 rear stainless steel butted and bladed straight pull spokes builds a strong and compliant wheel the cold forged and machined hub has polished bearing