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  1. #1
    Lance is not me
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    mega 9 ultegra or XT

    Greetings,

    Will an Ultegra long cage rear der work with an 11-34? or is it the XT, XTR line of deraillers only? If so, why?

    Thanks,
    NFields

  2. #2
    Senior Member
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    La Crosse, Wisconsin
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    No, the Ultegra or other Shimano road derailleurs won't work. You need the XT or another mountain derailleur.

    Shimano says their road derailleurs will work with up to a 27 tooth cog, although Sheldon Brown and others say they can go up to 30. I believe the side of the pulley cage will hit larger cogs. Pulleys on mountain derailleurs are spaced farther from the axle to accommodate larger cogs.

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