The Street > The Bike Shop
old man knees and crank arm length
JohnW:
I didn't feel much difference dropping from 180 to 175 years back, nor did I feel much now dropping from 175 to 170. Just changed it for foot clearance. I used to clip my pedal on the ground coming out of fakies way back when I ran 180s and had a cassette. Stopped happening with 175s, and this time I dropped a size for peg clearance. I really don't think it would be enough of a change to help your knees any, perhaps change sprocket size instead? I notice way more difference changing the sprocket by 2 teeth than cranks by 5mm.
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