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Knee's Hurting

Old 05-01-09, 12:31 PM
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dlharrison
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Knee's Hurting

Hey Gang - I need some assistance. Last fall, I purchased a 2007 Jamis Eclipse size 57cm and I rode if for a few rides before winter set in. I also have a 57cm Litespeed Tuscany 1999 model. Both bike are equipped with a Selle An-Atomica saddle. Both bikes are equipped with Look pedals. Several of the dimensions between the two bikes vary with the Jamis being larger than the Litespeed. I learned through this website that the Jamis bikes are more aggressive in construction dimensions. I have set up the Jamis bike identical to the Litespeed. I am the original owner of the Litespeed.

Everytime I ride the Jamis, my right knee becomes very painful. I gets to the point where I can not stand out of the saddle to pedal. I don't get the pain when I am riding the Litespeed. I went to an orthopedic specialist yesterday and found out that my knees are ok - no physical problems at all. Does anyone have any advice that they can give me. Thanks for your help .
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Old 05-01-09, 12:43 PM
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Is the gearing identical? Is your cadence slower on the Jamis?
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Old 05-01-09, 12:50 PM
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Two questions need to be answered first:
  • When you say they are set up "identical" what exactly did you adjust?
  • Where exactly does the knee hurt?

My guess is that you didn't adjust the sadle fore-aft relationship to the bottom bracket. The Jamis' saddle is likely further forward than the Litespeed, which will put different stresses on the knee.
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Old 05-01-09, 12:52 PM
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Could it be your seat height? Is it the front or back of your knee which hurts?
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Old 05-01-09, 01:08 PM
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The front of the knee hurts. The Jamis is a 10 speed with a compact crank and the Litespeed is a 9 speed with a compact crank.
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Old 05-01-09, 01:27 PM
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Originally Posted by dlharrison View Post
The front of the knee hurts. The Jamis is a 10 speed with a compact crank and the Litespeed is a 9 speed with a compact crank.
I'll assume that the new crank may be a single ring crank and, therefore, may be more narrow than the one on the older bike?????

I am, by no means, well versed in this.... But! You might want to give these a try.

http://www.bikescor.com/product/knee.htm

Otherwise known as knee savers.

They didn't cure my knee problems but the surely did help.
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Old 05-01-09, 01:37 PM
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I would start by looking at Saddle position. Height the same- Same position of the pedal/knee relationship.

That is presuming that the angle of the foot is the same on the two bikes. If you have the same pedals- I take it you use the same shoes on the two bikes. And are the crank lengths the same?
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Old 05-01-09, 01:48 PM
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Originally Posted by dlharrison View Post
The front of the knee hurts. The Jamis is a 10 speed with a compact crank and the Litespeed is a 9 speed with a compact crank.
This is possibly a seat position problem in which case, based on my experience, the seat may be too low resulting in the front of your knee hurting.

Try raising the seat about 1/2". Keep track by measurement. But, make sure it doesn't end up too high so that you hips are rocking sideways (and the back of your knee may start hurting). Are the axles of your pedals positioned at the balls of your feet?

Also, since trying to resolve this over the internet is a bit of a shot in the dark, maybe you should get a bicycle fitting from a credible lbs (local bike shop). As others have pointed out, among others things the seat also can be moved back and forth which is a factor, too.
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Old 05-01-09, 03:06 PM
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Assuming seat height is set by measuring from the pedal flat (or center of pedal spindel) at the down stroke and a consistent, with both bikes, straight line to the top of the saddle, seat height is not likely to be the issue. However, if the Jamis is more aggressive (which surprises me, because I have the Jamis Eclipse too, and find it a pretty relaxed & forgiving ride) you may need to more carefully consider the saddle fore and aft position. On a more aggressive geometry there is the possibility that, depending on how you measured to set things up, that the Jamis seat is too far forward. It's not a simple one dimension measurement when you have different frame geometries. Rather, it is the relationship between several point on your body that determines correct fore/aft position. Keep in mind that reach (typically associated with neck, arm, hand and back comfort) may be correct, but you could still be too far forward over the bottom bracket for the health of your knees. You don't need to get really scientific or technical to test this theory. Simply slide the seat on the Jamis back between 1/4 & 1/2 half inch and see if it makes a difference. When your seat is too far forward it places additional stress on the knee because of the sharper angle it produces during the stroke. You'll know if this is the issue after a short ten mile ride. Good luck.
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