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Does it make any difference?
Generally, crank length makes only a very small difference until you get to too long. That bargain might not be so much of a bargain if it turns out that 177.5 is too long for you. FWIW, I have 177.5 on the race bike, but I'm 3" taller than you with longer than average femurs. If you want to play safe, wait for a bargain to come up in 170, which will definitely be fine since there's pretty much no such thing as too short cranks.
gbj_tester
Crank arm length.
Wasn't sure where to put this. I usually ride 172.5 but have seen a possible bargain come up at 177.5. Does it make any difference? FWIW I'm sort of medium-sized, 5'10" and ~31" inside leg, femur normal size as far as I know. Apologies for mixing up metric and imperial. Cheers.
-edit- This is on a geared road bike BTW so clearance not an issue.