DescriptionNOVATEC A171SB F172SB Road Bicycle Cassette Hub Disc Brake SupportA freehub is a type of bicycle hub that incorporates a ratcheting mechanism, and the name freehub is a registered trademark of Shimano. A set of sprockets (called a “cassette”) are mounted onto a splined shaft of the freehub to engage the chain. The ratcheting mechanism is a part of the hub, in contrast to a freewheel, an older technology, which contains both the sprockets and a ratcheting mechanism in a single unit separate from the hub. In many high-end and midrange bicycles, freehubs have replaced freewheel systems.Specification:Price for 1 pair (Front & Rear)Hub model: Novatec A171SB F172SBSealed bearings: front 2 / rear 4O.L.D.: front 100mm / rear 135mmWeight: front 213g / rear 491g-ss or 414g-saSpoke holes: 32H / 36HColor: black / redCassette body: LS (light steel) or AL (aluminum alloy) (shim. 8/9/10s)
