Join Date: Sep 2001
Location: Sunnyvale, CA.
Bikes: 2004 Albert Eisentraut
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I can give you 2 pieces of advice from my limited 4 years experience with both Campy and Shimano.
1) before you start screwing around with the dérailleurs them self, try and squirt some thin lube into the STI shifter mechanism. Many many problems originate there.
2) a most common cause for non-linear shifting problems (shift OK on low gear, but not on high rears, and vis-a-versa) is the way the cable terminates on the derailleur itself. There is one specific way the cable must be clamped, and every little variation causes non-liner shifting problems.. Download the PDF for your derailleur from Shimano site and look at the directions of how the cable gets clamped. It is different from group to group..