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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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@gbj_tester
The vast majority of riders; you need one to hold the cassette on a geared bike when you undo the cassette lock ring. You can't combine them in one tool like you can for fixed, because you have to use both at the same time, not sequentially like on a fixed bike.