Profile Design Altair 52 Semi-Carbon Clincher Wheel Set Proprietary precision machined alloy hubs with custom depth flanges for extra stiffness Sapim CX Sprint spokes with hidden nipples for additional aerodynamics Sealed cartridge bearings Size: 700c x 20H Front/24H Rear, Radial front, 2X rear Weight: 1812 grams (w/o QR)