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  1. #1
    two wheeled accomplice
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    Deore LX RD-M580-SGS Derailluer not long enough

    I have the following equipment:
    Deore LX FC-M580 (42-32.22) crankset
    Deore LX CS-M580 (11-34) cassette
    Deore LX RD-M580-SGS rear derailluer
    mounted to a Surly LHT.

    The rear derailleur doesn't seem to be long enough to engage the last two sprockets on the rear cassette but as far as I know it is the longest one available. Is this normal? Is there any way to make it work?

    Thanks!

  2. #2
    Call me The Breeze I_bRAD's Avatar
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    That should work fine. Check your chain length.

  3. #3
    Senior Member SweetLou's Avatar
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    Which cogs are the last two, the biggest or the smallest cogs? Does this happen in all chainrings or just one?

  4. #4
    Senior Member
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    No reason it shouldn't work so I second the recommendation to check the chain length. If the chain too short to allow shifting into the largest cogs, it must be changed. Also, the derailleur's inner travel stop screw must be adjusted so the derailleur can move far enough inboard to reach the largest cog. Either of these could be your problem.

  5. #5
    two wheeled accomplice
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    ... the traveller cog physically hits the rear sprocket?

    I'm using a SRAM PC-991 chain.

  6. #6
    Call me The Breeze I_bRAD's Avatar
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    b screw

  7. #7
    Senior Member Bill Kapaun's Avatar
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    B tension adjustment screw needs to be set!

    http://techdocs.shimano.com/media/te...9830604989.PDF

  8. #8
    two wheeled accomplice
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    haha, of course! i'll set them up, you guys knock them down
    Last edited by Kazer; 04-29-08 at 08:18 PM.

  9. #9
    cycles per second Gonzo Bob's Avatar
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    Umm, there's no cable attached. I recommend attaching the cable first as it will tend to pivot the derailer back as it pulls it in which gives it clearance for the bigger cogs.

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