Rear deraillieur problem

samrey
samrey Posts: 14
edited July 2009 in MTB workshop & tech
Hi, I have a problem with my rear mech on my '08 Rockhopper Disc. I got a LX rear mech that whenever I am on the largest sprocket, the top pulley of my derailliuer bounces against the sprocket. I have tried adjusting the B screw which I have screwed all the way in and it still happens. I assume the chain is the correct length as it is still the original one (though not worn much). The gear shifting is fine, just the noisey rattling from the contact. The rear mech cage seems to be straight too. Any help greatfully received as it is sending me potty ;)

Comments

  • Graydawg
    Graydawg Posts: 673
    have you tried to adjust the cables?
    It's been a while...
  • samrey
    samrey Posts: 14
    Yeah, but it didnt seem to do much other than mess up the shifting! Is cable tension a factor?
  • stickygreen
    stickygreen Posts: 339
    you only need to adjust the cable like a mm i found that out today it only needs the tiniest adjustment.I kept on playing untill it was right a bit fiddly but it's spot on now.
    GENESIS CORE 20
  • Chaz.Harding
    Chaz.Harding Posts: 3,144
    Have you recently put on a new cassette, or new derailleur?

    Pics would be better, really!
    Boo-yah mofo
    Sick to the power of rad
    Fix it 'till it's broke
  • samrey
    samrey Posts: 14
    No, original cassette, I have probably only done a couple hundred miles or so from new. The only thing I have changed was the front mech for an xt. I will try cable tension adjustment in the morning, thanks for help!
  • samrey
    samrey Posts: 14
    Solved rear mech problem by turning b-screw upside down.The extra mil or so must have been enough! Thanks for all replies

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