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Middle Chainring interferance.(5 posts)

Middle Chainring interferance.niteschaos
Jun 17, 2002 8:00 AM
I have a triple chainring setup and am starting to get interference on my middle chainring when I use my largest cog. Is this something I can adjust using my limit screws on my front derailer or is this something that I have to take to a shop to get fixed?
re: Middle Chainring interferance.Paul
Jun 17, 2002 9:59 AM
I guess you're talking about the chair rubbing the front derailleur on the inner cage. If so, turn slightly on the inner stop adjust in a cw direction. This should move the der. away from the chain towards the bike. If there isn't any adjust left, or it's not enough, recommend starting from scratch. If this works, make sure you can shift up to your big chain ring. If not, adjust the outer limit in a ccw. On a double, I also adjust my left barrel, but this could cause a trim problem if you aren't careful. Cable stretch can be taken up by the barrel adjust.

Buy a bike maint. book for about 15.00, this stuff isn't rocket science.
Jun 17, 2002 4:47 PM
He said middle chainring. Adjusting the limit screws will have no effect, since the derailleur still has travel left to drop it to the small ring. Assuming that it is indeed chain rubbing on the inner derailleur cage, there are two options. 1 (most likely the right answer) is to turn the derailleur a bit on the down tube so that the rear part of the cage is closer to the frame. 2 (could easily be the problem as well) turn the barrel adjuster at the cable stop clockwise until the chain stops rubbing (the cage will move toward the frame). If this stops the cage rubbing but then the thing won't shift well to the large ring, go back to #1.
don't recommend turning the der. on the down tubePaul
Jun 18, 2002 2:53 AM
but rather the barrel adjust. This could cause an alignment problem, and if he looses up the der. too much, could slide down on the tube and hit the chain ring. BEst for a shop to do this. . Really need more input from him. I didn't want him to screw up his trim as this could affect his triple shifting. Limit screw should still move the cage even in the middle just like the barrel adjust would. You're shifting the der. I'll have to check my wifes triple to confirm this. CCW on the limit screw should move the der. away from the cage.

Sorry to the poster for the confusion. After I screw up my wifes bike (she'll kill me), I'll post the results.
UPPER and LOWER limir screws do not affect the MIDDLE by def.curlybike
Jun 18, 2002 6:02 AM