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  1. #1
    Life is good RonH's Avatar
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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.
    My bikes: 2001 Litespeed Tuscany---2015 Cannondale SuperSix EVO carbon

  2. #2
    Back in the Sooner State
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    Have you changed the cables and housings? May be time to replace the chain and cassette as well.

  3. #3
    Senior Member
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    Try cleaning the brifter

  4. #4
    semifreddo amartuerer 'nother's Avatar
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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.
    Can you pass the test?
    Yield to Life.

  5. #5
    Year-round cyclist
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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.
    All year baby! -40 to +40 riding weather.

  6. #6
    Senior Member Retro Grouch's Avatar
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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.

  7. #7
    Senior Member concernicus's Avatar
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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

  8. #8
    Life is good RonH's Avatar
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    I've had several since 1999 but have settled on my beloved 2001 Litespeed Tuscany and my latest, a 2015 Cannondale SuperSix EVO carbon
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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.
    My bikes: 2001 Litespeed Tuscany---2015 Cannondale SuperSix EVO carbon

  9. #9
    Back in the Sooner State
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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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