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  1. #1
    Senior Member
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    will a short cage rear derailleur prevent jumps off the front ring?

    I have an 8spd rear cassette that is tight enough for a short cage rear derailleur. I currently have a long cage xt rear derailleur and no front derailleur - just a 52 tooth ring. periodically (and annoyingly) the chain will jump off the ring to the outside - usually on a downshift to the 11tooth cog. Nevermind other available fixes (i.e. adding a fd, getting a tensioner or other device specifically for this problem) I just want to know if a short cage derailleur would help. Seems like there would be less wiggle to the jiggle during shifting with a short cage der, but that is based on nothing but rank speculation on my part. I have an unused ultegra short cage derailleur sitting on my bench, but don't want to waste my time swapping if it's not gonna help.

    thanks in advance for your thoughts.

  2. #2
    Senior Member sydney's Avatar
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    Is your chain the minimum length it can be, and maybe your chainline isn't as good as it could be?

  3. #3
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    chainline should be ok since I have never altered anything on the drivetrain except changing the cassette to a tighter gear range and replacing the chain. shortening the chain might help since it is the same length as when it had a larger largest rear cog. that's a good tip that I will try.

    still curious if a long cage rd creates more jiggle (or bigger wave as I've heard it described here) than a short cage.

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