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Old 01-19-06, 09:25 AM   #1
RonH
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Rear derailleur problems

I'm stumped. I took my bike to the LBS and they couldn't find a problem so maybe you folks can help.

My 9 speed Ultegra rear derailleur hesitates or doesn't shift when I'm shifting from cog 3 to 4, 4 to 5, 5 to 6, and sometimes 6 to 7. Same thing when going the other way. The cogs don't look worn. Happens on large and small chainring. This has been a problem for a few months.
I've cleaned and lubed the drivetrain but it doesn't help. I've adjusted the cable tension and tried turning the small barrel adjuster (1/4 turn increments) near the rear der.
The chain isn't stretched and has ~4000 miles on it.
The bike has ~11,000 miles.
Is the problem in the shifter?
Is it time to change the chain even though it isn't stretched?

Thanks for your help.
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Old 01-19-06, 10:22 AM   #2
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Have you changed the cables and housings? May be time to replace the chain and cassette as well.
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Old 01-19-06, 11:29 AM   #3
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Try cleaning the brifter
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Old 01-19-06, 11:49 AM   #4
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My money's on gunked up cable housings, in particular the rear loop. Try cleaning or replacing housing and maybe cable. Should not cost you more than about $5 maybe a little more if the LBS does it. Try that before other more expensive solutions.
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Old 01-19-06, 11:49 AM   #5
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I would check the cables and housing. I had the same problem a little while back and there was some crud buildup in the cable housing that was slowing the shift transition.
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Old 01-19-06, 11:50 AM   #6
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Have you checked the derailleur hanger alignment? Bikes with 9 and 10 speed cassettes are more picky about derailleur hanger alignment than bikes used to be.

I doubt you have a cable or housing problem because that usually causes hesitation when shifting into a smaller cog but shifts normally when going the other way.
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Old 01-19-06, 11:39 PM   #7
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I would defininitely check your derailleur hanger. my bike was doing the same thing. park tools has a derailleur hanger tool that'll bend it back into shape. maybe your LBS has one. if your hanger isnt replaceable, then that might be your best bet
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Old 01-20-06, 09:17 AM   #8
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Thanks for the suggestions.
I replaced the cables about 500 miles ago.
I'll check for a gunked up cable housing. Those weren't checked or replaced.
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Old 01-20-06, 09:52 AM   #9
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Replace housing when you replace cables. Not a bad rule to follow and it's not gonna cost much more than doing cables alone.
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