Shimano 105 R7150 Di2 12 Spd Double Front Derailleur The Shimano 105 FD-R7150 Di2 Front Derailleur implements 12-speed Di2 technology to keep your big rings shifting smooth as butter. The new Shimano 105 12 Speed Di2 groupset brings the benefits of semi-wireless electronic drivetrains to their workhorse line of components. Pro level features are now available for every-day cyclists. Features: 12-speed Fast, precise front shifting Adjustable via smartphone connection 7100 Series Features: Semi-wireless electronic drivetrain Newly designed ergonomic shift levers Minute shifting adjustability via the connection with your smartphone Easily changeable batteries Sleek aesthetics across the entire group