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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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@CelesteGreen
http://cycleseven.org/bicycle-gear-inch-calculator
Here is a good GI calculator, it looks like for a 700 wheel with a 23 tire its 26.26, not 27, so GI actually a bit lower.
Size of tire makes a cignificant difference!!