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PostPosted: Thu May 31, 2012 2:16 am 
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Hi,

Buffled over why my knee always acts up whenever i ride my TT bike. Knee would hurt during intense effort, so far all bliss when i ride my RD bike. Brief setup of both bikes:

> TT bike with a 76 degrees SA, saddle setback 5cm behind BB;

> RD bike with a 74 degrees SA, saddle setback 4cm behind BB.

Both bikes with the same saddle, ride using same shoes and pedals.

Besides setback adjustments, any other suggestions? TIA

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Posted: Thu May 31, 2012 2:16 am 


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PostPosted: Thu May 31, 2012 2:24 am 
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Location: Melbourne, Australia
Different cadence during efforts on the TT bike?

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PostPosted: Thu May 31, 2012 3:29 am 
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Location: New York
Check saddle height on both bikes: center of BB to top of saddle.

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PostPosted: Thu May 31, 2012 4:50 am 
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Cadence slightly lower when on TT. Aren't this the usual?

Saddle height is similar between both.

More suggestions?

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PostPosted: Thu May 31, 2012 4:56 am 
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I suggest to take other measurements and see how much they differ between the bike. The measurements need to be exact not similar.
Knee pain is a result of saddle height or cleat adjustment or both.
This is all I can provide.

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I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree


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PostPosted: Thu May 31, 2012 7:15 am 
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how low is your position on the TT bike?
could being hunched over be causing tightness thats leading to a knee not tracking right or something?


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PostPosted: Fri Jun 01, 2012 1:12 am 
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Trying out Rotor ring to see if it alleviates :)

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PostPosted: Fri Jun 01, 2012 2:03 am 
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Location: New Zealand
Crank Lengths?


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PostPosted: Fri Jun 01, 2012 3:11 am 
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Where is the pain? In front or back of knee?

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PostPosted: Fri Jun 01, 2012 3:52 am 
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Location: eh?
Yes, describe the pain. Where, onset, etc.

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PostPosted: Fri Jun 01, 2012 4:52 am 
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Thanks.

Pain is at front of knee, above the knee cap. Most intensely felt when pedaling downwards at 3 O'clock position...

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PostPosted: Fri Jun 01, 2012 6:37 am 
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Don't mean to be a broken record but are the crank lengths the same between bikes?


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PostPosted: Sat Jun 02, 2012 5:00 am 
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Location: eh?
Spring Knee (see Andy Pruitt)? Maybe the more closed angle at the hip on the TT bike is the culprit.

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PostPosted: Sat Jun 02, 2012 5:09 am 
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Thanks for all the suggestions. Looking into them. ..

In the meantime, I've installed a rotor q ring to see if it alleviates. To ascertain , which spider arm does one align the Position 4 with in the ring? Watching videos and readups, I'm still confused. Thanks.

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PostPosted: Sat Jun 02, 2012 8:14 pm 
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Which crank? On eg. Shimano, Sram, FSA, Rotor cranks it's the hole opposite to the crank arm.


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Posted: Sat Jun 02, 2012 8:14 pm 


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