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Old 06-16-08, 02:37 PM   #1
speedlever
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chain rub

Just started this morning.. and I can't find where it's rubbing. I hear the scriiiitch... scriiitch sound and feel it when I'm cranking on the LH downstroke. That's the only time I hear/feel it. Easy riding and it is silent.

When I shift from the small chainring to the mid chainring, no noise. From the mid to the large chainring, no noise. But when I shift from the large to the mid chainring and put some power in the downstroke, there it is again in its irritating glory. Doesn't seem to matter what gear the rear cassette is in.

I can't find anywhere it's rubbing. It won't do it when I'm watching it in a stand. Have to put some power in it to create the noise. Crank bolts are tight. Everything looks good. But something's amiss.

Any suggestions what to look for?
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Old 06-16-08, 05:03 PM   #2
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You may want to check the front derailleur, I would guess particularly the inside portion of it? If you find rubbing there, adjust the cable tension and lubricate the front derailleur hinges
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Old 06-17-08, 06:00 PM   #3
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Yep. Turned out to be the front DR. Was a bit low such that when cranking on the LH pedal, caused the chain to rub.
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Old 06-18-08, 08:27 AM   #4
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Let me state for the record (this being an election year) my belief that chain rub is better than <shudder> knob rub.
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