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@gbj_tester
53/15 = 93", suits me given an average of 24.5 to 25mph. Obviously you'll need to scale up to the speed you do, and adjust for your preferred cadence, then tweak it according to whether you're training for souplesse or stength, and apply modifying factors to suit the course and weather conditions. In other words, asking other people what gear they use is fun, but not necessarily useful. I can get beaten just as comprehensively by people spinning 72" as by others churning 120"
There are a few pointers to what some fast people have used at
http://www.fixedwheel.co.uk/fixedwheel%20records.htm