Originally Posted by
max5480
you're switching to longer cranks so you can spin your legs faster going downhill?
what's your logic?
longer radius = larger circumference = longer distance your legs have to travel in the same amount of time (assuming cog and chainring remain the same) = more work
Shorter doesnt always mean better. I have ridden 165,170,and 175. I spin the best on 175s. My height may throw off this observation, but to me it says that different lengths affect your legs' range of movement and that may give or take away from how comfortable you feel spinning