ben sheldon a la réponse :
If you want to use Ergo or STI brifters with direct-pull cantis, there are two workarounds available:QBP Travel Agent
You can use a pulley device, such as the QBP Travel Agent (Q.B.P. Photo). These are a bit of a hassle to set up, but do work. Any pulley of the small diameter commonly used on bicycles eventually leads to fatigue failure of the cable, so check the cable regularly for fraying.
If you have a bike with skinny tires and no fenders, there are "shorty" direct-pull cantis that are more-or-less compatible with drop bar levers.
Neither of these systems is ideal, and neither is really any better than traditional center-pull cantilevers.
je m'en doutais un peu... mais cette conf est si déconnante qu'il n'y a pas de solution constructeur?