I've been using 175s since I've been mtn biking about 6 years.
I'm 5'6" and just picked up a 170 crankset. I know it's about 3 % less torque, leverage but does it really make a difference? I always seem to bash the 175's. I figured I can live without the 3% leverage and make up for it in the gears.
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Thread: 170mm vs 175mm cranks