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How long should my cranks be?(5 posts)

How long should my cranks be?Long Crank
Jan 3, 2002 5:14 PM
Hey, I am a 15 year old MTB racer who is riding the road for training and racing next season. My question is what should the legnth of my cranks be? I'm 5 feet 7 inches and weigh 140. I currently have 175's on th MTB and road bike.

long enough to meet your feet!mr_spin
Jan 3, 2002 5:16 PM
Ha ha. A little Abe Lincoln humor for you....
Not much of an issueKerry Irons
Jan 3, 2002 5:49 PM
Some claim great powers from different crank lengths while others can hardly tell the difference. Your body can adapt. At your height 170 should be fine, but if you get 172.5 or 175, it's no biggie.
re: How long should my cranks be?Crash
Jan 3, 2002 7:16 PM
I really struggled over 172.5 or 175 until someone pointed out that the difference between the two is basically two credit cards stacked on top of each other. I stopped worrying after I heard that. Unless you are racing I think it's kind of a non issue. I've even ridden a bike with a 180 crank, kind of liked it (of course it was attached to a Calfee Tetra Pro).
How long should my cranks be? 175mm.guido
Jan 3, 2002 10:12 PM
Well 175 is the safest. It's the same as your mountainbike, which is what your legs are used to.

170mm is standard on road bikes because roadies like to spin at high cadences along the nice, smooth pavement. It's easier to spin shorter levers.

Mountain bikes come with 175mm levers because you get a little more power on the stroke in gnarley off-road terrain. If you're training for mountain bike racing on a road bike, there's alot you can do to increase stamina and power, but why confuse your legs having to scribe different sized circles?

Roadies also like the slightly greater power they can work on 175mm levers.