Shimano XT FD M780FD M785 Top Swing Front Derailleur. Any drivetrain can work when the trail is flat and the sun is out. When things get gnarly, you need a drivetrain that can really deliver. The new Shimano XT group is built to last. Ride in the rain, in the mud, beat it, bang it, crash it, and it still keeps on kickin'. There are two options to chose from, one designed to work with either a Dyna Sys 3x10 drivetrain, the other with the Dyna Sys 2x10 drivetrain, giving you smoother shifting and more gear combinations than ever before.