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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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Hulsroy
Regarding your folding bike project, maybe take a look at CdM 2021? Part of the brief was that "all entries are able to be easily dismantled to a size small enough to arrive car-free on an SNCF train – just 120 centimetres long and 90 centimetres high".