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  1. #1
    Junior Member
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    derailleur bounce

    Hello, I've encountered a small obstacle recently. I purchased new square taper cranks/chainring, and after installing on the bike, and testing them out, I began experiencing a "bounce" from my rear derailleaur, after every four or five pedal revolutions. I purchased a similar set of new st cranks/chainring for another bike, and the same thing started happening. Both bikes rode fine before this. It's not alignment, nor stiff links. All suggestions welcome. Thanks.
    Last edited by mauricio2; 09-04-11 at 03:08 PM. Reason: new info

  2. #2
    Senior Member
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    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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    The frequency of the problem hints at a chain problem, ie. once per loop of the chain.

    Check your chain for a stiff link as follows. Shift to a neutral gear where it backpedals smoothly, ie. outer and 2nd or third sprocket. push the RD tension pulley forward so the lower loop sags a few inches, and back pedal slowly while looking looking for a link that doesn't straighten immediately into the curve of the sagging lower loop.
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  3. #3
    Senior Member
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    Buffalo, NY
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    Quote Originally Posted by FBinNY View Post
    The frequency of the problem hints at a chain problem, ie. once per loop of the chain.

    Check your chain for a stiff link as follows. Shift to a neutral gear where it backpedals smoothly, ie. outer and 2nd or third sprocket. push the RD tension pulley forward so the lower loop sags a few inches, and back pedal slowly while looking looking for a link that doesn't straighten immediately into the curve of the sagging lower loop.
    ^^^
    This. Stuck link somewhere.

  4. #4
    aka Tom Reingold noglider's Avatar
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    Case closed.
    You don't read my signature anyway, do you?

    Tom Reingold, noglider@pobox.com
    Residences: West Village, New York City and High Falls, NY
    Blogs: The Experienced Cyclist; noglider's ride blog

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