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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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@mashton
This one is lovely, but takes a while to load. But, you can downlaod the applet and just run it straight on your PC.
http://software.bareknucklebrigade.com/rabbit.applet.html
It does skid patch calculation and gives leg rpm / mph for different gears as well.