Join Date: Sep 2008
Location: Loveland, CO
Bikes: Two LOOK 585s, one KG461
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The most common problem with 10 or 11 speed drivetrains using the new ultrashift levers is cable friction. If you have a cable friction problem, the shifts to smaller cogs may hesitate. The typical response to that would be to reduce the cable tension, but if it's reduced too much, the shifts to larger cogs will not be quick and smooth. That's how the 11 speed drivetrains got the reputation for being finicky. A lot of owners change the cable tension back and forth, trying to fix a friction issue, that can't be fixed with cable tension adjustments.
Some of the common cable installation mistakes include shortening the cable loop at the RD, not cutting the cable ends squarely and using a routing at the bars that has a tight bend. I chose the rear routing for my bike because the short reach bars that I use have a tight bend on the front side of the bar, that's sure to be a problem.
There are some frames that have such restrictive routings that the friction problem may not have a solution.