Rear mech pulls forward

epic comp 2010
epic comp 2010 Posts: 11
edited June 2011 in MTB workshop & tech
Dont know if the two are connected but.

Replaced chain with new SRAM 991.

All ok except that the rear mech pulls forward when under pressure?

I have read somewhere that the chain may need a full lube (i will try that this eve).

XT cassette is not very old and does not look worn.

Any ideas?

Comments

  • supersonic
    supersonic Posts: 82,708
    Could be chain suck ie the chainring not releasing the chain properly and pulling the mech forward.

    Can happen with new chains on worn parts.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

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  • epic comp 2010
    epic comp 2010 Posts: 11
    Thanks for that.

    Although the cassette has not had a huge amount of hours (Deore XT)

    How can you tell if its worn? The teeth do not look like shark fins etc
  • supersonic
    supersonic Posts: 82,708
    Not the cassette, the chainrings. You need to try and catch it when it is happening and look down! Does the chain ride on with the rings?
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • epic comp 2010
    epic comp 2010 Posts: 11
    Ok, will have a look and get a mate to have a look to try and see.

    I dont think so because i tried to look my self and there seems to be no noticeable cause.
  • morleyman200
    morleyman200 Posts: 513
    how worn was the old chain?
  • epic comp 2010
    epic comp 2010 Posts: 11
    Not noticeably bad but was over 1% worn on the gauge
  • madmole
    madmole Posts: 466
    B Tension?
    Too wide a chain (7 speed on a 9 speed system)
    Stuck Jockey Wheel or chain not correctly fed through Jockey wheels
    Kink in new chain
    Marin Mount Vision 2005. Fox RL100/RP3. Hope Pro 2/Mavic XC717/DT rev. Cinders 2.1, XTR, Lots of bling

    Cervelo S3 2011. Mavic Cosmic Carbonne SLE. RED. Q-rings, lots of bling and very light!
  • epic comp 2010
    epic comp 2010 Posts: 11
    No, it was a 991 and has been replaced by a 991.

    I will have time to give it a good going over tonight so will report back :)
  • epic comp 2010
    epic comp 2010 Posts: 11
    Found middle ring to have very slight burring on the teeth.

    Only a few and they looked like the metal had "crushed" a little.

    replaced the ring and all is smooth.

    Thanks for replies

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