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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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@jad21579
See Sheldon Brown's (rest in peace) website
http://sheldonbrown.com/gears/
Here is a SS / Fixie gear calculator link from his stie as well....does all the calculations for you. You just got to put the info in
http://software.bareknucklebrigade.com/rabbit.applet.html