These are the Halo Spin Doctor hubs 8/9 MTB and Universal MTB front.
The universal is versatile; light enough for Cross Country, rigid enough for Freeride, buff enough for DH. It uses 2 huge 6804 Industrial cartridge bearings, and runs on a Flex Free 20mm internal aluminium tube axle, with screw-in regular 9mm QR compatible ends.
The 8/9 is an all purpose MTB sealed bearing rear cassette Disc hub for Cross Country, Freeride, or 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.
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