I am stumped. I have a new Pinarello Paris Carbon Frame with full Campy Record (New, QS Ergo Double). The bike has less than 1,000 miles on it and has been built up by my LBS. Twice now, my front derailleur has snapped at the band. Each time, this has occured when shifting up from the small to the large chainring. In neither case was I hammering. In both cases I was coming out of my warm up and going to the big chainring. Both derailleur bands broke in the same spot (snapped in two) and it seems unlikely that the source of this problem is a faulty derailleur. Having said that, we are at a loss to understand what could be causing this. The full gruppo is a matched set.
Any ideas/thoughts would be GREATLY appreciated!