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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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@BringMeMyFix
I switched the stock 12t for a 13t on my SS Brompton. 69" is plenty for urban stuff, especially with the rolling resistance of 16" Marathons. Everyone needs to spend more time doing 69.
My tank bike has 47/39 (big ring outside with 13-23, small ring with 11-21 on turbo with heavy resistance curve), and my more mercurial bike has 50/38 with 12-23. #notveryinterestingeventome #allaboutthechainline