What is wrong with my Shimano 105 5800 front derailleur?
I've been riding the bike and really took a look today at the shifting while riding.

In the big/small combo, it looked like it just wasn't pulling enough cable to get it over far enough.

While I was riding I had an idea, perhaps the cable position coming from the cable stop had an effect (it should since it is basically a projection of the pull onto the the FD lever arm).

The cable stop was a clamp on aftermarket one, since the Civia Hyland doesn't have cable stops.

When I got home I decided to test it some more. I did two things :


moved the cable stop up and down
rotated the cable stop around the down tube


I managed to find a position where it worked! Barely, the tolerances on this thing are tight, but I can get it positioned where it barely doesn't rub now on small/big and on big/small.


The cable stop was too close to the FD, it needed to be moved down.
The cable stop was rotated too far away from the FD, it needed to be rotated closer to the centerline of the downtube.


This fixed the problem, these new FDs have very tight specs, it still barely, barely doesn't rub.

At least I have a cable stop that I can move around, if the cable stop were in a fixed position I couldn't have fixed this.