Chain Rubbing on Front Derailleur

Underpants
Underpants Posts: 120
edited June 2009 in MTB workshop & tech
First proper ride out tonight and I've found out that my chain rubs quite badly against the front derailleur when on the smallest ring at the rear and middle or largest ring at the front.

I know a small amount of chain rub is ok but this seems a little excessive. Is there anything I can do?

Cheers

Comments

  • nicklouse
    nicklouse Posts: 50,673
    more cable tension.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • supersonic
    supersonic Posts: 82,708
    And/or H stop winding out if above does not fix.
    GT ZASKAR CARBON TEAM

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  • Underpants
    Underpants Posts: 120
    I dont know what either of these suggestions mean..? :oops:
  • MrChuck
    MrChuck Posts: 1,663
    Underpants wrote:
    I dont know what either of these suggestions mean..? :oops:

    More cable tension: The tighter the cable (adjusted by turning the little knob where the it comes out of your shifter) the more the cage will be pulled outwards. Unless....

    H stop winding out: The mech probably has 2 little screws on it that limit how far it can move inwards and outwards, marked L and H respectively. Could be that the H one is set so it can't move out far enough.

    Don't make enormous adjustments, just a little quarter turn and see how you go.
  • nicklouse
    nicklouse Posts: 50,673
    Underpants wrote:
    I dont know what either of these suggestions mean..? :oops:

    have a read

    http://www.parktool.com/repair/readhowto.asp?id=75
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Underpants
    Underpants Posts: 120
    When turning the H screw should I be loosening or tightening??

    Thanks very much for your help. I'll have a go tonight.
  • MrChuck
    MrChuck Posts: 1,663
    Er, should be tightening (I think)- try it and see if it's worse or better! The Park site nicklouse linked to will confirm and is well worth a look.
  • nicklouse
    nicklouse Posts: 50,673
    well it depends on why you are turning it.

    have you added tension? what did it change? if you want to move the mech out you need to allow the stop to move more.

    if you look normally you can see the end of the screw and where it touches the stop. and unscrewing the screw moves it away from the stop allowing more mech movement.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • Underpants
    Underpants Posts: 120
    Thank you chaps.
  • Underpants
    Underpants Posts: 120
    Tried doing this last night and completely effed it up and now it's twice as bad on 2 of the 3 rings at the front :evil: :cry:

    Back to the shop tonight

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