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  1. #1
    Riding With Scissors mattzees's Avatar
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    shimano ultegra derailleur

    I just popped a spoke on my rear wheel. I was going pretty quick, the spoke got caught in my chain, and wrecked my rear derailleur. It's completely bent up, missing a gear, etc.

    I have a full Shimano Ultegra group, double in front, 9-speed in the rear. I need to buy a replacement derailleur, and I see a bunch on EBay, but I have some questions first:

    1) Some of the derailleurs I see listed are described as "triples". I thought all 9-speed Ultegra rear derailleurs were the same. Does it matter if my front gear is a double or a triple? Why would this affect which model or rear derailleur I buy?

    2) What is the difference between long-cage and short-cage derailleur? How do I tell which one I currently have? Does one perform better than the other?

    3) Is there a model numer on my derailleur somewhere that I'm just not seeing? A model number would make things a lot simpler.

    Thanks.
    "So, what do you think of our mountain?"
    "Tastes pretty good..."

  2. #2
    Keep on climbing
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    Apr 2004
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    A "triple-compatible" rear derailleur is the long-cage version. Due to the small size of the granny gear on a triple, the derailleur has to be able to take up a lot of chain slack; therefore, the long-cage version is (usually) needed for triple setups.

    Long cage derailleurs shift a tiny bit slower then their short-cage counterpart, but both will work just fine with double-cranksets.

    Long cage picture here.

    Short cage picture http://bike.shimano.com/catalog/cycl...=1151452708914.

    Those pages also contain the model numbers, although I don't know if they're easily visible (I don't have an Ultegra derailleur in front of me). You should be able to determine which you have from the pictures as the long-cage version is pretty long.
    "There is more to life than increasing its speed" -- Mahatma Gandhi

  3. #3
    Senior Member capwater's Avatar
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    Dec 2004
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    Ultegra rear derailleur model number RD-6500.

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