The Shimano Dura-Ace 9000 C50 Carbon Tubular Road Front Wheel is for the performance driven triathlete and road racer. This front 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. Digital cone-bearing adjustment for smooth rotation performance. Shimano angular contact bearings and oversize A7075 alloy axles.