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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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@andyp
Ved - use this;
http://software.bareknucklebrigade.com/rabbit.applet.html
The size of the wheel (and the tyre) affect the gear size. On a 27" wheel 48x18 is 72 gi but on a 700x23 wheel it would be 70.1 gi.