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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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@markrjohnson
44/16 with 700x28 for the winter commuter.
47/16 with 700x23 on the summer/best steed.
24/16 with 26x1.95 on the mud plugger.
Tyre size makes a big difference, check out this:
http://software.bareknucklebrigade.com/rabbit.applet.html
Its free and covers everything.