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@AngelD
I'm starting to see why Tester says its pointless with regard to power output, as there would be no difference.
But power output can be used in different ways, and for someone constantly stop/starting in a city, 165mm cranks might be a help as its literally moving less weight each rep, but you'd probably have to cycle going on a century a day for it to be of any noticable benefit, and likewise for someone touring, or spending virtually all day at a constant cadance with few stops, the additional weight would act a bit in principle like a fly wheel.