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Old 11-01-05, 12:52 PM   #1
Mr_Super_Socks
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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.
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Old 11-01-05, 12:57 PM   #2
sydney
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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?
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Old 11-01-05, 01:01 PM   #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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