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  • I also have a MTB single speed which is something like 36x12 (77gi). Its only used on roads though. I have a geared MTB for off road.

    Moving my current mountain bike from 57 GI (36:16) to 65 (36:14) .... I don't think I would able to push 77GI without foot retention ( I ride with some cheapo BMX pedals).

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