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  1. #1
    Hit em hard!
    Reputation: bludwig's Avatar
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    Rear derailleur hitting frame

    My rear derailleur is smacking the bottom of my frame everytime I go over a big bump or land a bunny hop. What can I do to fix this? I threw together this pic in paint to further show the issue (Not my actual derailleur in pic)
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    Last edited by bludwig; 03-27-2009 at 06:14 PM.
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  2. #2
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    Reputation: JonathanGennick's Avatar
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    Could it be that your b-screw needs adjustment? Go to the following link and read the section on that topic. It might help.

    Of course, the problem could be something else.

  3. #3
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    Reputation: bludwig's Avatar
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    I'm thinking thats probably the issue. I checked out parktool.com and read about it. I'll have to adjust it and see where I can get with it. Thanks for the info.
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  4. #4
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    Reputation: boomn's Avatar
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    My wife's bike with a Deore RD has this same problem. I did notice how weak the spring felt on the main pivot (around the derailleur hanger bolt); it takes almost no force to push the body of the derailleur in an arc towards the frame. I do not remember my X.7 RD feeling like this when I used gears and I never had a problem like this with it.

    Tightening down the B-tension screw did rotate the derailleur further back, but it had no affect on the strength on this spring unfortunately.

    My next attempt to solve the problem involves a new SLX Shadow derailleur sitting in a box, ready to go Time to treat my wife and hopefully give her something that works better

  5. #5
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    Besides the "B" screw adjustment, check that the stop tab which engages the hanger isn't bent or sheered off.
    fb
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    The key to solving any problem is to understand and address the underlying cause.

  6. #6
    Meh.
    Reputation: XSL_WiLL's Avatar
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    Shimano derailleurs have always flopped around a bit like that. The new Shadows don't. As mentioned, check the B screw and that the stop tab isn't damaged.

    You can zip-tie a piece of tube to the knuckle to dampen the noise.

  7. #7
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    Reputation: bludwig's Avatar
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    Thanks for the advise, With your help I should be able to figure it out. Thanks again!
    My Mountain Bike Blog! http://michiganmtbr.wordpress.com

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