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Chain rubbing on front derailleur(4 posts)

Chain rubbing on front derailleuralchemy
Oct 22, 2003 8:42 PM
I recently had my chain and cassette (both Ultegra) replaced. When I go from the small chainring to the large, the chain rubs against the outside of the front der cage. A tap on the small lever on the shifter fixes it.

My LBS adjusted it and it's better but still annoying. I think I need to adjust the H screw slightly. Rather than take it back again, is my guess correct and is the outside screw on the FD the one that needs adjusting. Or is there a better way to fix it ?
re: Chain rubbing on front derailleurdivve
Oct 22, 2003 10:20 PM
The small shifter paddle normally drops the derailleur down to the inside. Therefore, it would be logically to assume your H-screw is adjusted too far out. The derailleur is slightly over-shifting. You might also have to relax the cable tension a bit after making adjustments in order for the down trim to index properly. Test this by shifting down first. Then up again. Trim adjustments tend not to properly take effect until you actually make a proper shift.
I think you mis-read the postKerry Irons
Oct 26, 2003 5:22 PM
The poster said the chain rubbed on the outside of the derailleur. Your talking about rubbing on the inside. I'd say that if hitting the trim position fixes this, then there really is no problem. However, turning the barrel adjuster "out" would position the cage so that it was less likely to rub on the chain.
the question is indeed confusing...divve
Oct 27, 2003 1:26 AM
The below didn't make much sense to me. If the chain already rubs on the outside of the derailleur, won't it rub even more when you tap the smaller shifter paddle? ....unless of course the chain is actually on the outside of the cage:)

"the chain rubs against the outside of the front der cage. A tap on the small lever on the shifter fixes it."