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  1. #1
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    Problems with RD M581

    Hello everyone!

    I have a Merida Kalahari 550 SX. I recently upgraded the drive train to
    - CS M580 cassete sprockets 11-34
    - RD M581 SGS read derailleur
    - FC M580 cranckset.
    - SL M580 rapidfire plus shifters.

    Shifting seems smooth, as far as I can say, but haven't really tested it
    while climbing.

    When trying to shift to the 34 teeth sprocket, the derailleur's drive sprocket
    gets too close to the cassette's sprocket. This causes shifting between the
    30 and 34 teeth sprockets. The problem can't be avoided by decreasing
    tension in the derailleur ... so finally I am not able to use the 34 teeth sprocket

    did anyone face the same problem? how did you solve it?

    Is it ok to figure out some workaround to it (that will increase the distance between
    the derailleur and 34 sprocket)?

    Thanks
    Da Bear

  2. #2
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    Reputation: SteveUK's Avatar
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    Have you tried screwing in the body adjust (B) screw?
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    What luck for rulers, that men do not think - Adolf Hitler

  3. #3
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    Re

    Yes, I did. In fact I screwed it in completly and the guide pulley still touches the sprocket.
    Is it because of the chain length? I used the tech' service instructions from Shimano website. -->

    http://cycle.shimano-eu.com/media/cy...9830590923.pdf

  4. #4
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    Reputation: SteveUK's Avatar
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    The SGS version shouldn't have any problems with a 34t sprocket ('though you know that!)
    What is the difference between the old and new drivetrain? Do you have the 48t version crankset? Is it larger than your old one?
    Can you post a picture of the rear end, with the chain on the two biggest rings? Not that you should ever ride in that sprocket combination, but I'd be interested to see the mech's position.

    Steve
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    What luck for rulers, that men do not think - Adolf Hitler

  5. #5
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    Re

    Hey!
    I have a 44 crankset.

    It was the low adjustment screw. The guide pulley couldn't get exactly over the biggest sprocket. Now it's perfect.

    Thanks a lot

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