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@marie
Yeah I've got Joni's old polo bike. I probably need to do some more maths, but at the moment I've got a 44t ring on there, so if I got 20t and 14t freewheels I could run 45.9GI and 65.GI, which would be perfect. I might have to compromise on the polo gearing though, really need it to be a bike I can sensibly ride to work daily.
Or I do have a 34t ring too, could maybe get away with 34x14 (65.6GI) and 34x19 (48.3GI)?