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Yes indeed you are quite right miscalculation from my side! if only 9mm difference, with change of crank arms pedal axis will only lower for about 4mm which does seem acceptable but I reckon if it fits 38 would be better anyway!
@Lolo more or less old 700C bike with not much clearance currently fixed that I would to re-convert to gears with 650B tires to have a more relaxed ride
paulbiche
only 9mm drop (half of wheel diameter difference)