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Thread: Rear Derailler

  1. #1
    GDR is offline
    RoadBikeReview Member
    Join Date
    Jul 2009

    Rear Derailler


    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
    Join Date
    Feb 2009
    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
    Join Date
    Nov 2004
    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
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  4. #4
    Pathlete and Pedalphile
    Reputation: redondoaveb's Avatar
    Join Date
    Jan 2011
    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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