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Thread: Rear Derailler

  1. #1
    GDR
    GDR is offline
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    Rear Derailler

    Hi,

    I just put a new rear wheel on and changed my cassette to an 11-25 from an 12-25. The shifting is working fine except when the chain is in smallest cassette cog, the rear derailleur hops. I checked the alignment already and everything looks fine. Please help.

  2. #2
    I play for keeps
    Reputation: locustfist's Avatar
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    Could be 2 things

    B screw: put it in the largest cog and set the upper pully so it just clears the cog and runs smooth.

    Cable too tight: if it's aligned right and jumping on the smallest cog there is most likely too much tension. bring the barrel adjuster IN until it settles down. I usually set the limiter on the small cog with the cable completely undone and slack.

  3. #3
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    could be what locustfist suggested, those are the most likely things. slim chance, but if you have a wipperman connex link on your chain, and it's installed upside down...that could also be it. more likely a very small difference in limit screw/cable tension adjustment from your other cassette.
    i work for some bike racers...
    2013 Trek Madone 5.9 w/ '12 SRAM Red
    2010 Cervelo T1 sprint bike
    Ruger 10-22TD
    Smith&Wesson M&P 15-22
    Smith&Wesson M&P 9
    oh, those belong in another forum

  4. #4
    Pathlete and Pedalphile
    Reputation: redondoaveb's Avatar
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    It's not the chain skipping on the 11 cog? I know when I changed from an 12 to an 11, I didn't know any better and used the lockring from the 12, not knowing it was a little larger. When I was on the 11, the chain would skip on the cog.

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