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@vikingfixed
I use 40:23 on the bike I just built, which gives about 43 GI on 26 inch wheels. Mainly cos that's what I had to hand. Could go slightly lower, which dave has on his bike(38:23 I think). A lot depends on what you have available and whether you want to spend any money(I'm notoriously averse to that where possible). Freewheel at the mo, but soon to be fixed.