The Shimano Dura-Ace 9000 C50 Carbon Tubular 11-Speed Road Wheel Set is for the performance driven triathlete and road racer. This wheelset has 50mm deep D2 rims 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.