Super durable, all-purpose thru-axle disc front and rear hubs. CNC 6061 aluminum body with 7075 aluminum axle . 2 sealed cartridge bearings in front, 3 in the rear plus a radial needle bearing. Available with either XD or HG 8-11sp cassette body (not compatible with HG 11sp road cassettes). International Standard 6-bolt disc rotor mount