Halo Spin Doctor Disc Rear HubAll purpose MTB sealed bearing rear cassette Disc hub. Light enough for Cross Country, rigid enough for Freeride, buff enough for DH. The Spin Doctor rear disc hub uses a bolt-on 2 bearing cassette body with an integrated 3 pawl positive engagement drive. This places the 2 main hub sealed bearings on the outside of the hub (beyond the cassette body), providing superior axle support. The “outboard bearing” construction reduces axle flex and thus reduces bearing wear When bolted together, the cassette and hub body become a strong, integrated unit, with 2 sealed cartridge main hub bearings and 2 integrated Freehub looseball bearings Features: Sweeping shell styling and minimalist type International Disc mounts provide a beautiful looking, strong, light, rear MTB hub. 6061 Alloy CNC machined shell. International 6 bolt Disc Mounts. Precision CNC Cr-Mo QR axle system. Lightweight knurled alloy non-slip drop-out faces. Bolt-On 2 bearing integrated cassette body system. Durable “Outboard” sealed cartridge bearings. Compatibility: Quick Release 135mm. (included as standard – excludes QR skewers)Buy Halo Wheels & Tyres from Chain Reaction Cycles, the World’s Largest Online Bike Store.