Join Date: Mar 2003
Location: Grand Prairie, TX
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I'm sure you've done this, but:
Have you properly set the indexing? The STI shifters have four detents separated by three clicks. One is for the big ring, two are for the middle ring, and one is for the small ring. I like Mark's and RG's explanations better, but I also wonder if you are trying to get by with using the inner three detents across the three chainrings.
I normally install a new cable by shifting onto the small ring, leaving the barrel adjuster a little toward the short end, and pulling fairly hard on the end of the cable as I tighten the clamp screw. It is then ususally a simple matter to shift up and down and likely take up some tension with the barrel adjuster, to get things just right.
It usually seems like I need to set the indexing with STI so a little bit of overshift is needed to get the chain to jump up on the big ring, and as I stop pressing and let the lever sit on the detent, I have the perfect index setting to prevent rub on any cog except the inside one, with the big ring.