The shimano dura ace 9000 c35 carbon clincher 11 speed road rear wheel is the most versatile wheel everyday reliability or race day performance proprietary shimano carbon alloy construction process optbal spoke system enhances wheel rigidity and durability extra wide hub flange maximizes lateral rigidity high strength lightweight titanium freehub body digital cone bearing adjustment for smooth rotation performance shimano angular contact bearings and oversize a7075 alloy axles