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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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Glws
PhilDAS
BSA is Birmingham Small Arms, an historic manufacturer of guns, bicycles and motorcycles. BSC is a thread specification derived from the earlier CEI spec, featuring a 60° flank angle and 26TPI pitch for most sizes above 1/4". An ISO threaded bottom bracket uses the thread form of BSC with a pitch of 24TPI and a major diameter of 1.37"