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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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@AngelD
This page is a big help working out gears, rpm and speed, amongst other things. I actually found it on one of the threads on this forum when investigating ratios for my current build and was my introduction to LFGSS. Can't remember who was responsible, but many thanks!
http://software.bareknucklebrigade.com/rabbit.applet.html