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svenhöek-
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
Thanks @mdcc_tester, that does result in 18mm drop
700x25 <=> 622+2*25=672mm
650Bx35 <=> 584+35*2=654mm
Considering that I currently run 170mm crank arms and I never had any pedal strike (currently running fixed), switching to 650B and 165mm crank arms woud result in 13mm pedal axis drop which does appear to be quite a bit even if it wouldn't be fixed anymore but with gears, would it be a problem? I assume that this discussion would be much easier with the BB heigh measurement but I do not have it yet. I reckon it would be quite better to run 38mm wide tire to reduce the drop