SHIMANO ULTEGRA DI2 R8050 2x11V Braze-on front derailleur

Based on the new Ultegra 8050 electric groupset, the SHIMANO Ultegra Di2 8050 2x11V braze-on front derailleur front derailleur has been designed to offer a wider range of speeds, without compromising shifting performance, and just as quietly.
 

Fast, smooth chainring shifting is guaranteed in all conditions, even when you're rocking the big chainring.
Shimano's Synchronized Shift technology synchronizes front shifting with any rear shifting, enabling both derailleurs to work together efficiently.
With Semi-Synchronized Shift technology, it's the other way around: rear shifting is synchronized with any front shifting, thus maintaining an optimal gear ratio.
At the same time, the Di2's auto-trim function automatically centers the front derailleur precisely around the chain, avoiding any chain friction as the chain moves through the cassette. That's how fast, precise and smooth your shifting can be.