While Shimano's mechanical front derailleurs have always worked flawlessly to deliver quiet, precise gear shifts, its Di2 system has taken it to a whole new level. We can't overstate the precision of a Di2 front derailleur, and if you're running double chainrings on the trail, we can't imagine settling for anything other than the 2 x 11 XT Di2 FD-M8070 Front Derailleur. With proper installation, you can forget about dropped chains forever and the woes of chain rub will become just a dark, distant memory. Shifting also becomes quicker, easier, and more precise. All of this is achieved with an increase in shifting power that's never affected by cable stretch or contamination. Cable routing is also simpler and cleaner, and, perhaps most importantly, setup is easier due to Shimano's newest generation of its E-Tube electronics system.