Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
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I agree that the cable routing to lengthen the lever arm is a bit crude and wouldn't produce the same effect for all users.
One way to tell if the lever arm is close to the correct length is to take the chain off, start with the upper pulley aligned with the smallest cog, then shift to the largest cog. Swing the upper pulley so it's close to the large cog, to see if the total travel is too great or too little.
The problem is the Campy shifters pull an average of 2.8mm and the Shimano RD only needs 2.5mm. 11 speed shifters are much closer, with an average pull of 2.6mm.
One other suggestion is to concentrate on the shifts to larger cogs first. Those shifts require cable pull. If those all work, then worry about the shifts to smaller cogs. A cable friction issue can make those shifts perform poorly, even with the proper cable tension. Reducing the cable tension is not the way to fix a cable friction problem.