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Triple shifting: Road vs. MTB(3 posts)

Triple shifting: Road vs. MTBgoat29
Aug 19, 2002 1:30 AM
How come my XT equipped MTB has shifted flawlessly without adjustment or excess rubbing for years, but my new Ultegra Triple equipped Road bike requires constant tweaking, and even at it's optimum settings, rubs and clicks at every chainring change? And why does the Ultegra front derailleur require 2 clicks to find the middle ring while the XT doesn't?

Surely the shifting principle is the same regardless of the terrain?
Two things.Spoke Wrench
Aug 19, 2002 4:51 AM
1. STI triples can be a pain to set up. They are a lot fussier than mountain bikes to set up. Usually when you have persistant problems the solution is to start over from scratch carefully positioning the derailleur on the seat tube and setting the limit screws.
2. A typical Ultegra triple should shift a lot better than what you have described.
re: Triple shifting: Road vs. MTBChen2
Aug 19, 2002 6:57 AM
I think the problems you are experiencing are partly due to the difference in chain ring sizes from the small 30t up to the middle 42t. The chain has to climb a long ways up and I think it's typical with the Ultegra triple to need to go to the second click stop (detent) to make that shift, and then if the chain is on the left side of the cassette you need to trim back a click to avoid chain rub. You should be able to adjust the derailleurs and cables so that the shifts from the middle to the big ring and back to the middle are smooth. The shift from the middle to the small is a big drop and requires some patience to do smoothley. The big problem is going from the small to the middle, as you know. (This is the reason I've stayed away from triples, so far.)
~Al