This versatile wheelset reigns supreme with an aerodynamically dimpled rim surface that controls air resistance for an average power gain of 1-4 watts. Zipp 84 front and 202 rear hubs roll on bearings with 10-millionth of an inch tolerance. 18F/20R (radial front / 2-cross drive and radial non-drive side lacing). 711 g. front, 884 g. rear (QR skewers not included). Shimano-10 compatible.