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Crank arm lengths, question...(7 posts)

Crank arm lengths, question...IRIE
Sep 9, 2002 5:39 AM
Are their any advantages to longer or shorter crank arm lengths? (170, 172.5, 175).

Thanks in advance.

Greg
I think that it depends.Spoke Wrench
Sep 9, 2002 5:59 AM
If you happen to be 6'7" or 4'11" how could it not matter?

I'm 5'10", right in the middle for American men. The research people say that for a guy like me it doesn't matter. I suspect they are right.
Makes no difference to me.dzrider
Sep 9, 2002 7:27 AM
I have 170 on one bike and 175 on another. I can't tell any difference. My cadence feels no faster on the 170 and I feel no more leverage with the 175. I may be in different gears and spinning slightly differently to accomadate them, but I couldn't remeber even if I wanted to.
re: Crank arm lengths, question...Chen2
Sep 9, 2002 9:51 AM
I guess there could be a slight difference in ground clearance and saddle adjustment. I'm 5'9" with 31" inseam and ride 172.5 cranks because that's what my LBS sold me.
~Al
re: Crank arm lengths, question...mapei boy
Sep 9, 2002 10:16 AM
I'm 5'7". When I went from 170 length cranks to 172.5's, I definitely felt a difference. With the 170's, I always felt like a hamster in a cage. With the 172.5's, I feel as if I'm able to grab onto the road a little more securely. I have more torque. Because of the larger amount of motion the 172.5's require, my leg muscles are able to stretch more. Thus, thus, my legs are less prone to cramping.
And then there's the dataKerry
Sep 9, 2002 5:09 PM
Which doesn't support any particular crank length, either indepently or in conjunction with body size. All kinds of studies have supported long, short, middle, and Lennard Zinn did a test with a very tall, average, and very short riders that showed no perference and no increase in performance correlation. Then of course there are all kinds of THEORIES about crank length that MUST be true by logical argument. Unfortunately, there is no research that consistently supports any crank length. Short answer, if you like it, fine, but don't be thinking there's some optimum you can pursue.
re: Crank arm lengths, question...bm
Sep 9, 2002 10:57 PM
just reads today in Joe Friel's "Triathlon Training Bible" that longer cranks are sometimes use for better time-trials. i think one of the cyclists who posted before me said something about more torque

otherwise, i think, different cranks are used for different geometry