URSUS Wheels Rear Wheel Miura CB58 Clincher with Shimano/Sram Sticker, White Featuring twin aluminum hubs with an excellent compromise between lightness and reliability The rim is 3k carbon monologue with aluminum braking surface for those who like the convenience of clincher but require a high profile carbon rim Convex rim 58mm increases the aerodynamics of the wheel and allow the rider to maintain long straights at high speeds