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@gbj_tester
Yes.
Longer cranks only work if you can move your knee over the required distance both comfortably and while making optimum power. To do that, you need either a long femur or a large range of hip flexion, or some mix of the two. Of course, long femurs usually go with tall riders, who usually go with large frames.
FWIW (i.e. nothing) I have 175 on my geared bikes and 170 on my singlespeed/fixed bikes, with the exception of my TT bike which has 175 at the moment and will have 177.5 soon. I can't say I ever notice any difference switching from 170 to 175 or vice versa