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Chain not running straight on lower jockey wheel of rear derailleur

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Chain not running straight on lower jockey wheel of rear derailleur

Old 01-09-09, 05:19 PM
  #1  
imaxwell
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Chain not running straight on lower jockey wheel of rear derailleur

I have a 9 speed ultegra cassette and rear derailleur. In the smallest 4 cogs on the cassette the chain will not run straight on the lower jockey wheel of the rear derailleur. It comes in at an angle which causes a rattling noise. On any of the other cogs it is fine. While in the big ring there are NO issues either.
It's a new SRAM chain which I'm certain is the right length.
Anyone got any ideas as to what the problem is?

Thanks.

P.S. Apologies if this has been dealt with before but I have trawled the forum and cannot find a similar post.
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Old 01-09-09, 07:41 PM
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mcoomer
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You're crosschaining when you rung the small ring with the smaller cogs. If your Hi and Lo limit screws are set properly and your shifting is good then all you can do is shift up to the big ring. One thing I would do is grab the lower pulley with your fingers and see if you can twist it excessively. It may be that you're experiencing some wear in the pulley that's aggravating your cross chain situation. Still, I suspect that you're simply going to have to shift up in the front.

Mike
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Old 01-10-09, 09:52 PM
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skylla
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Weird. I tried searching about this exact problem last week and didn't find anything, and now here it is.

Mine started doing acting up a couple weeks ago--the chain bouncing off the lower pulley so that it comes in sideways and gets forced on by the cage, and makes a lot of noise in the process. At first I could make it go away by backpedaling for a moment, but it got worse. On Thursday after the problem moved up two more cogs I took the bike inside at work to look more closely at it (my office is nice that way...). Half of the teeth on the pulley (every other tooth) were totally worn down--no leading edge at all. So I flipped it over! Which got me home with no recurrence and back in on Friday with just 2 or 3 quick instances of the problem.

I took it to the shop to get a new pulley, and instead the mechanic straightened the derailleur hanger and also the derailleur itself (he said it was "twisted"). He didn't replace the pulley, hopefully because he didn't think it would be necessary (rather than because he didn't think he'd be able to find a pulley to fit my 7-speed Suntour Blaze derailleur...). It worked fine on the way home, and I'll have to wait and see if it's permanently fixed.

But yeah, I guess the moral based on my experience is that you can probably make the problem go away with a new pulley but the fact that it arose in the first place might mean your derailleur is out of alignment.
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Old 01-10-09, 10:35 PM
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ogbigbird
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check out the cage alignment, to make sure nothing is bent or simplely out of alignment. maybe the hanger, but doubtful. any picts?
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Old 01-11-09, 05:49 AM
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Originally Posted by ogbigbird View Post
check out the cage alignment, to make sure nothing is bent or simplely out of alignment. maybe the hanger, but doubtful. any picts?
I don't think that a bent derailleur hanger is doubtful at all. Whenever I encounter a rear derailleur shifting problem that doesn't respond to normal tuneing practices the first thing that i do is to check the derailleur hanger alignment. Almost always, that's the answer.
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Old 01-11-09, 06:05 AM
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onbike 1939
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Originally Posted by Retro Grouch View Post
I don't think that a bent derailleur hanger is doubtful at all. Whenever I encounter a rear derailleur shifting problem that doesn't respond to normal tuneing practices the first thing that i do is to check the derailleur hanger alignment. Almost always, that's the answer.

My experience also. Now for this type of complaint, it's the first thing I look at.
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