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Crank and leg interface length adjustment question.(6 posts)

Crank and leg interface length adjustment question.Zippy
Dec 10, 2001 9:52 AM
I have a stronger right leg than left. To compensate, I feel that I should use different crank lengths, thus effectively changing the gearing from one leg to the other.

I know this is common amoungst pros (Pantani and Zabel, for example), but does anyone know how to test for what difference in lenghts is needed for a given difference in leg strength?
Not the reason...TJeanloz
Dec 10, 2001 10:02 AM
The pros who do this don't do it because one leg is stronger than the other, but because one leg is significantly longer than the other as a result of very bad crashes.

It would be a disaster for your spin to have two cranks of different lengths if your legs were the same length.
Eeek!cioccman
Dec 10, 2001 10:15 AM
I'm a frequent visitor to my Orthopedic man. Having had bad bone breaks, been in skeletal traction, had pins, rods, the whole ordeal, I'm still not nearly off kilter enough to have different length cranks.

Orthotics are specifically designed to take care of leg length differences. If they are not drastic enough to take care of this, the next and only step is specially designed shoes with a lift. I believe I'm over a quarter inch off and that is only slight according to my podiatrist. A natural difference of a half inch is surprisingly common.
Eeek!TJeanloz
Dec 10, 2001 10:26 AM
Pantani went face first into an SUV on a descent in the Giro in (I think) 1996. He was messed up in a big way. Most riders are able to compensate with orthotics or shims under their cleats, but extreme cases require different length cranks.
re: Crank and leg interface length adjustment question.cioccman
Dec 10, 2001 10:04 AM
Well, I don't know how to compensate for difference in leg strength, except, for working a weaker leg or arm a little more than the strong one to even things up.

As far as your subject of leg length adjustments go, most people have a leg and an arm that is slightly longer than another. Most people are not exactly evenly symmetrical in any fashion whatsoever.

This is typically taken care of with a good pair of orthotics. Find a Surefoot or see your doctor. Otherwise, as I've mentioned below, if you're really serious about getting fit and lined up properly, find a bio-mechanic specialist. Our team uses a popular gentleman that works with many other teams and pro teams.
How about...Anachor man
Dec 10, 2001 10:40 AM
You just make one side of your saddle a little higher till you feel right? :-)