Halo SupaDrive MT-SS Hub. Features: Tough, instant pickup 120 point triple wedge pawl system with a short single speed style HG driver for Singlespeed and Dirt Jump No cog is included so user can choose the gearing that works best, 11-16t. Use a wide-foot single speed cog Forged 6061 aluminum shell, 2 main body sealed cartridge bearings CrMo M10 bolt-in fittings with 6mm anti-rotation hex fitting (helps when tightening wheel in frame), 14mm adapters included International Standard 6-bolt disc rotor mount Specs: F R:rear (1sp) Axle Spacing Mm:10x135mm Hole:32h Color:black Weight:315g