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Crank lines?(3 posts)

Crank lines?JBurton
Jul 2, 2002 3:14 PM
My road bike, which I was fitted for, has 170 mm Cranks. My mountain bike has 175 mm cranks. I am about 5'6" with a 30" inseam. I weigh 135 lbs. I haven't noticed that the crank arms seem too long on my mountain bike, but I understand that a guy my size with my weight (I am NOT a sprinter) should go with shorter cranks. Anyone have any guidelines concerning crank length? Recommendations? Will I finish stronger up hills on my MTB with shorter cranks? Does anyone know of any web resources concerning crank length?
re: Crank lines?atpjunkie
Jul 2, 2002 4:29 PM
for your size 170's or 172.5's will do you fine. If you like to stand and mash 175's will work but if you are more of a "spinner" go with a shorter crank.
No such thing as guidelinesKerry Irons
Jul 2, 2002 5:19 PM
There are no reliable studies showing any relationsip between body size (of any bone or limb) and optimal crank length. Your body is highly adaptable, and so can make the best of any reasonable situation. Longer cranks tend to reduce your cadence, so you may end up going up one gear, but other than that, it's all personal preference and whether you want to spin a little more or mash a little more. Some people will tell you that they sense great differences from a 5 mm length change while others will say they can't tell the difference. The latter are probably closer to the truth than the former.