Another variable is femur length. It drives people to longer cranks and more seat setback to get a good hip angle. With longer than average femurs (from bike fit sessions) a longer crankarm is a better match, at least for me. I have 175's on all my bikes and prefer that for climbing. It may be because of my mountain bike background but 170's feel odd climbing. It's not something I notice spinning on the flats. ... slightly above avg at ~6ft.
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