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Fitting Your Bike Are you confused about how you should fit a bike to your particular body dimensions? Have you been reading, found the terms Merxx or French Fit, and don’t know what you need? Every style of riding is different- in how you fit the bike to you, and the sizing of the bike itself. It’s more than just measuring your height, reach and inseam. With the help of Bike Fitting, you’ll be able to find the right fit for your frame size, style of riding, and your particular dimensions. Here ya’ go…..the location for everything fit related.

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Old 02-06-14, 01:04 AM   #1
hyperlitenerd
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Interesting fitting issue

Hello everyone,

I have been trying to fit my girl friend on her bike for a while now. We are finishing up college, which is why we have not spent the big money on an intense bike fit yet.

The problems I am seeing. Her hips rock, no matter what I do. Over the past 2 years we have moved her saddle up and down all with no change. Recently checking her knee over spindle, we found out that when her right knee is over spindle, her left knee is about 2cm behind the spindle given the same saddle position. She does not seem to have a leg length difference, she was a competitive ncaa cross country runner for a while, with no known issues. I think this may point to why we have hip rocking. Any thoughts on what could be causing this?
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Old 02-06-14, 01:59 AM   #2
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maybe its not bike fit just the "style" of her pedal stroke.
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Old 02-06-14, 02:21 AM   #3
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Does the hip rocking cause pain?
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Old 02-06-14, 10:58 AM   #4
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There is no reported pain from the hip rocking. It just seems strange that her hips rock.
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Old 02-06-14, 02:28 PM   #5
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always liked the view ..
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Old 02-06-14, 02:38 PM   #6
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Would not worry. Though what is her spinning speed? Many pros rock their hips when doing a high effort time trials with somewhat lower from normal rpm's.
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Old 02-07-14, 10:52 AM   #7
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Your measurements of her KOPS and total leg length suggest she has a right femur that is longer than the left, but interestingly her tibia is longer on the left to compensate for this. This may cause her hips to rotate about the central axis of her body and may look like her hips are rocking up and down. You should observe her to see if this is the case. If so I would set the KOPS to be the average of both legs that way you minimize the effect of the femur length difference. However this rotation of her hips may be her normal riding form and if she is not having pain, then it works for her.
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Old 02-07-14, 04:58 PM   #8
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Quote:
Originally Posted by fietsbob View Post
always liked the view ..
I was gonna say that it only looks like her hips are rockin' because you're lovin' looking at 'em!
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