Profile Design Altair 52 Full Carbon Clincher Wheel Set Altair 52 Full Carbon Clincher Wheelset 700c x 20H Front/24H Rear, Radial front, 2X rear Proprietary carbon fiber 52mm section full carbon clincher rim. Precision machined alloy hubs with sealed cartridge bearings and custom depth flanges for extra stiffness Hand-built assembly. Sapim CX Sprint spokes with hidden nipples for additional aerodynamics Color: UD carbon finish with colored decals, black hubs and black spokes. Weight 1699 grams