Super loud 3-pawl 9t driver makes this Street/Dirt rear hub stand out. Driver runs on bushings, not bearings for long service life. Large diameter hollow Ni-CrMo axle, 8mm hex bolts to lock the hub on. Aluminum shell with sealed cartridge bearings . International Standard 6-bolt disc rotor mount. See Non-Disc Hubs for Rotary front hubs. 470g