Precise positioning motors to move the derailleur cage and gently back and forth quickly, thus ensuring fast, quiet and precise shifting forward. It also allows the e-tube connection to the other system components, the front derailleur automatically depending on the position of the switch mechanism and the choice of chainring trim in the optimum position in the chain and never drags on the baffle.
Shimano Dura-Ace Di2 9070 2x11sp Front Mech Features:
Fast, precise, smooth gearshifts
Buy Shimano Dura-Ace Di2 9070 2x11sp Front Mech from Chain Reaction Cycles, the world's largest online bicycle store.