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Problems with bottom bracket mount front derailleur

hennezhennez Posts: 255
edited January 2011 in MTB workshop & tech
hi,
Have got a few problems with the bottom bracket mount front derailleur on my 2008 model genius 20. there is an adjustement to change how high the derailleur sits off the large chainring though it is right rown and is still sitting too far off the large chainring :?
the main problem is that I cannot get the derailleurs set right so that the chain is not rubbing on the derailleurs in certain gears :? I've had it down @ the bike shop and the bloke down there cant work it out so I was wondering if anyone had had similar problems or knew what to do about it....
My bike takes me places that school never could

Posts

  • nicklousenicklouse Posts: 50,675 Lives Here
    what gear combos is it rubbing in?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • The RookieThe Rookie Posts: 27,804
    The high screw stops the chain being pulled right over the big ring, it doesn't set the derailleur position at all.

    We had a similar problem with my Daughters E-type mech (Scott Voltage, without the additional stabilising mount at the base of the seat tube), a substantial cable tie round it and the seat tube to stop the mount bending* sorted it.

    *The cable pull wasn't just rotating the mech around its pivots but bending the mounting plate out from the seat tube as well, thus ruining the indexing of cable pull to cage movement.

    Simon
    Current steed - Whyte T129, 2013 frame, mongrel Revelations, Giant dropper, Stans S1 wheelset. 12, Magura Trail Sport brakes, 1x11. 12.8Kg
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