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Cranks are Longer? ("Don't mean Ginseng Up")(7 posts)

Cranks are Longer? ("Don't mean Ginseng Up")MXL02
Nov 8, 2002 9:00 AM
I was reading a paper by Ed Burke on bicycle fit from 1994, and he stated that the standard crank arm length was 170 mm and that only people over 6'2" should have 175 mm crank arms. I've seen several references to 160 and 165 mm cranks in the literature...are people tending to use longer crank arm lengths than before?
Remember... this is only one guys opinionPODIUMBOUNDdotCA
Nov 8, 2002 11:43 AM
You have to remember this is just one guys opinion. Everyone has an opinion and just cus he wrote a paper on it doesn't mean he's right. In my opinion the whole crank arm debate is just a cash cow for bike shops. Realistically unless your a pro or incredibly short or talk you don't even need to think about it because its not gonna make that big a difference. Even then its not all that necessary. Remember the rider makes the bike... not the freaking crank arm length. :)

Thank you!MXL02
Nov 8, 2002 1:57 PM
I am tired of agonizing over mms! I just wanna ride!
I noticed a huge difference....Bruno S
Nov 8, 2002 5:42 PM
going from a no-name flimsy 175mm crank to a DuraAce 180mm. Three rides after the change, one chainstay broke at the weld and had to get the frame replaced. I attribute that to increased torque.

I'm 6'3 with a 36.5" inseam. I agree that for most people the standard 170mm is ok.
This is a joke, right?Kerry
Nov 9, 2002 6:35 AM
Are you atually claiming that you broke your frame because of the extra power you got from going to 180 over 175? Or (I hope) you're jerkin' our gerkins.
This is a joke, right?Bruno S
Nov 9, 2002 8:32 AM
No, I am claiming that the frame broke because the stiffness of the Durace cranks AND the 5mm of extra length. The original cranks were not good at all and they flexed quite a bit. During the first month of using the new cranks my knees hurt a bit. I can assure you the difference between the two cranks was easy to notice. Of couse the frame was defective (I am not Superman) but I do believe that the cranks contributed to it breaking.
No cause and effectKerry
Nov 10, 2002 11:09 AM
It is very hard to accept that the frame braking and the change in crank length were related. I don't doubt that they happened as you describe, but I can't believe that going to longer, stiffer cranks caused the frame to break unless the frame was already shot (and cracked) beforehand. Just not possible.