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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@gereonb
It is not fixed.
It has a freehub which is what a gear cassette is mounted on, the freehub just contains the freewheel mechanism. The cassette slides on and is fixed with a cassette lockring. You can buy different cassettes with different gear ranges. There are only two types of cassette Campagnolo and Shimano, they have different splines so are not interchangeable, you need a matching free hub.