Features Cup and cone CULT ceramic bearings - Campagnolo Ceramic Ultimate Level Technology (CULT) Aluminium oversize right-hand rear flange for rigidity and maximum torque transmission Special brake pads for maximum braking on dry and wet surfaces. Carbon Fiber Rims: 50mm deep rims are structural carbon which imparts both lightness and stiffness Hubs: Carbon Fiber and Aluminum Construction with rear hub with oversize right-hand flange Spokes: 18 front - 21/G3 rear variable section Compatibility: Campy 9s/10s/11s Tubular Only Bora Wheels come with valve extenders for your sewups 1310 grams per set