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Old 05-29-06, 11:20 PM   #1
oilman_15106
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Strange bike noise?

Skip posting Park Tools links, I have run thruough all the frame noise advice with no luck. Anyway here is the problem:
New 105 drivetrain with 250 miles on. The noise can only be compared to the squeaking sound of a new stiff pair of shoes. It is from the rear der. area. When the bike is in a work stand you can hear the squeak when the crank is moved back an forth about 1 inch. Everything appears to be properly lubricated and the chain line and B adjustment looks good. Also shifting is fine. It is not from the crank area. Any ideas would be appreciated.

Almost need a call in show like Car Talk to describe this.
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Old 05-29-06, 11:49 PM   #2
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I don't know what is causing it but a good trick I learned in automotive work is to use a stethescope of sorts. Just about anything will work. Old paper towel tubes work good.
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Old 05-30-06, 07:33 AM   #3
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Thanks for the tip. If I can not track it down, it is off to the LBS for some help.
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Old 05-30-06, 10:29 AM   #4
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Sounds like a dry jockey pully bushing. The jockey pully is the upper pully and floats to allow for indexed shifting. When it is dry, it sqeaks like shoes. You'll have to remove it, and apply a tiny amount of bearing grease to it.
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Old 05-30-06, 10:50 AM   #5
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Quote:
Originally Posted by DieselDan
Sounds like a dry jockey pully bushing. The jockey pully is the upper pully and floats to allow for indexed shifting. When it is dry, it sqeaks like shoes. You'll have to remove it, and apply a tiny amount of bearing grease to it.
Second that. I bought a used 105 and it squealed like crazy. Squirted some oil on in the bearing and its fine now.
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Old 05-30-06, 02:30 PM   #6
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Quote:
Originally Posted by DieselDan
Sounds like a dry jockey pully bushing. The jockey pully is the upper pully and floats to allow for indexed shifting. When it is dry, it sqeaks like shoes. You'll have to remove it, and apply a tiny amount of bearing grease to it.

Third this:

pull out the jockey pulleys, open them up and put a tiny amoutn of teflon grease in both sides (DON'T LOSE ANY TINY BALL BEARINGS, or misc parts form inside of there...open up each pulley in an ashtray if you need to!), and also lubricate the joint where the jockey arm meets up with the rest of the deraileur.

This should fix your issues.
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Old 05-30-06, 06:15 PM   #7
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Some jockey pulleys don't have bearings, but a brass bushing. The 105 long cage I use has a bushing. For a quicker, easier fix, drip some machine or air tool oil into it while pedaling. This is just a short term fix.
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Old 05-30-06, 11:33 PM   #8
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Well it took some investigation but here was the culprit: The dust/water seal on the rear wheel, made of some kind of rubber like stuff, was making the sound when the wheel was rotated. Had to disassemble the cassette to get to it. Lubricated it with a dry teflon stuff made by Dupont, no longer sold, and reassembled.
Noise is gone.

I was 100% convinced it was the rear der. when I started to fix this. Called my LBS and they said this was not an uncommon problem on Shimano wheels but the issue usually is the dust seal slipping out of its position.
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