This Shimano RS81 C50 Carbon Laminate Clincher Rear Wheel is a high performance road racing wheels meets the demands of today’s professional and amateur riders. The 50 mm deep, 22.4 mm wide (D2) carbon rim with alloy braking surface for improved aerodynamics and increased rigidity for sprinters and TT specialists. This wheel is both light weight and rigid whilst maintaining high braking performance with standard brake pads. The cold forged and machined hub has polished bearing races to reduce friction and provide for smooth rotation. While the Labyrinth double contact sealing effectively shut out water, mud and dirt without affecting rotational smoothness.