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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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@AngelD
cog/Noun: A wheel or bar with a series of projections on its edge that transfers motion by engaging with projections on another wheel or bar.
Each of such a series of projections.
sprock·et/Noun: Each of several projections on the rim of a wheel that engage with the links of a chain or with holes in film, tape, or paper.