Road Nazi Hunter
Join Date: Jul 2007
Location: Slow! But Ahead of You.
Bikes: Kuota Kredo, Litespeed Vortex, Aegis Victory, Burley Tandem, Cannondale Rush
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I have run into a couple of shifting problems with Campy 10 speed rear derailleurs. One time on a bike that I built from scratch after buying a frame and building it up. Next a friend had his shifters rebuilt and it kept skipping gears in the middle of the cassette.
Both cases were based upon the limit screws. I found that if you open the screws up way beyond necessity, start from the outside gear, adjust the cables, then set the limit screws only at the end of the process, I was able to get back in sync. What is scary, you can hit the highest gear and the lowest gear, but it seems to skip in the middle. The chain dances up and down between a couple of gears and it seems you can't time them all. After opening up the limit screws, adjusting the cable, the resetting the screws, we eliminated any problems. One time, it was a new derailleur setup, another a five year old rebuilt set of shifters. Same result.
What I learned was to let the shifter control the chainwork through it's detents, then set the limit screws to prevent overshifting.