Shimano rs81 c24 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 pads20 rear and 16 front stainless steel butted and bladed straight pull spokeshigh lateral rigidity is improved with a wide flange spacinglabyrinth double contact sealing low friction seals effectively shut out water mud and dirt