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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 ride 46x17 a lot - great up hills, and only starts to feel spinny on the flat once you're trying to keep 25mph ticking over for any length of time. Pretty much the same as 48x18 (well, only an inch in it, init).