Elite road racers require reliable and precise shifting, and the FD-R9150 Dura-Ace Di2 11-speed front derailleur E-tube double braze-on delivers just that with its lightweight yet durable design. Featuring Synchronized Shift technology, it automatically selects the next largest or smallest gear ratio, eliminating the need for trimming or chain rub. The Di2 front derailleur operates smoothly, thanks to a microchip communication link with the gear levers. Additionally, when you shift the rear derailleur, the front derailleur automatically trims itself. For fast, quiet, and effortless shifting with cutting-edge technology, the FD-R9150 Dura-Ace Di2 11-speed front derailleur is the perfect choice. Features: Braze-on fit as standard; with mount adaptors Self trimming Silent, smooth shifts 11-speed E-tube Di2 compatible Compatible with 50-55 tooth chainrings Total capacity 16T Weight: 104 grams