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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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jackc
https://www.decathlon.co.uk/p/1-speed-bike-chain/_/R-p-257 is a galvanised KMC chain in a Decathlon box, in stock in many branches. It's holding up well on my RollerFort, where everything else is terminally corroded, so mere rain isn't going to be any challenge.