The Shimano Dura-Ace 9000 C50 Carbon Clincher 11-Speed Road Rear Wheel provides aerodynamic performance with the convenience of clinchers. This rear wheel has a 50mm deep D2 rim design to optimize aerodynamics and stability. OptBal Spoke System enhances wheel rigidity and durability. Nipples below rim bed enhances aerodynamics and fluid appearance. Extra-wide hub flange maximizes lateral rigidity. Proprietary Shimano carbon construction process. High strength, lightweight titanium freehub body. Digital cone-bearing adjustment for smooth rotation performance. Shimano angular contact bearings and oversize A7075 alloy axles.