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  1. #1
    mtbr member
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    Jun 2013
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    SRAM X9 Derailleur chain jumping off bottom pulley help me

    Hello all,
    I have a SRAM X9 rear derailleur and the chain jumps off the lowest pulley. It started doing it consistently about 2 weeks ago. There is no real rhyme nor reason for it to happen. Sometimes I can just be coasting or sometime when I am going over log piles or really rooted area. Can the pulley wear out? Can it be replaced? Or just an adjustment? Thanks for your help.
    a

  2. #2
    Rub it............
    Reputation: frdfandc's Avatar
    Join Date
    Sep 2007
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    3,818
    Pulley can wear out. Life expectancy depends on conditions the bike is ridden.

    But since it's during coasting or bumpy areas like a long root section, the spring for the cage might be worn, depending on age.

    If this is worn, you might be able to pick up a cage/spring kit instead of a complete derailleur.

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