With a very smooth gear shift in both directions the feature gladly kept from the Dura-Ace Di2 is the automatic trim function, eliminating annoying chain rub for good, no more messing trying to fine tune the front mech by hand. No doubting the quality and speed of the front mech shifting, it has to be lived to believe the sheer smoothness of front motor shifting during forceful gear changes.
The non use of titanium brings in a weight of 160g up 35g on the Dura-Ace.
