Home › Words › F › freehubfreehubfreehub · noun — A type of bicycle hub incorporating a ratcheting mechanism, with a cassette, or set of sprockets, mounted onto a splined shaft of the hub to engage the chain.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom free + hub, genericized trademark.nounA type of bicycle hub incorporating a ratcheting mechanism, with a cassette, or set of sprockets, mounted onto a splined shaft of the hub to engage the chain.e.g.“In many high-end and midrange bicycles, freehubs have replaced freewheel systems.”Definitions & examples from Wiktionary (CC BY-SA 3.0).