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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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@edscoble
11-34t - 11, * * 13, * 15, * 17, * 19, * 21, * 23, * * 26, * * * 30, * * * 34t
12-30t -12, 13, 14, 15, * 17, * 19, * 21, * * 24, * * 27, * * 30t.
12-28t -12, 13, 14, 15, * 17, * 19, * 21, * 23, * 25, * * 28t.
stars show how big the jump are between each sprockets, hopefully give you some ideas of what sound like an idea ratios for you.