The 12-Speed 105 FD-R7150 Di2 Front Derailleur is new to the 105 line-up. The design almost appears to be more like the Ultegra 11-Speed R8050 version, yet while tipping the scales at about 142 grams, the new design shifts 45% quicker than that model, which was already pretty fast and efficient. The R7150 model is only available in a braze-on type design, and if you require a clamp, you must use the specified Shimano SM-AD91 model in the proper round tube size.

In the R7150 Di2 set-up the shifter levers, which require a very low power requirement, employ a secure wireless communication system are amply powered via dual coin cell batteries in each shifter body that will average about 3-4 years of use before needing to be changed. The front and rear derailleurs handle the motors and actual shifting action and they are still powered by a new cylindrical internal seatpost battery (BT-DN300) which features three wiring ports for the SD300 e-Tube wires. Shimano rates the battery level at about 2000km of use, meaning you rarely have to charge the battery, which is much more powerful. As such, each derailleur has it's own wire that goes directly to the battery. Why is there a third wire port on the BT-DN300? Well, Shimano allows you wire the R7170 system for 12-Speed TT levers (only offered in various Dura-Ace and Ultegra options) in a special wiring configuration that results in a single SD300 wire going to that remaining third port. By moving the charging and control access to the R7150 rear derailleur, Shimano also delivers easier adjustment, a more stable charging connection, and overall simplicity that current Di2 users will deeply appreciate.

Functionally speaking, the FD-R7150 has been optimized for two chainring combinations: 52-36, and 50-34, with the 16T difference o the max allowed by the derailleur guide cage shape. The materials have been selected for the best combination of reliability, functionality, weight, and durability. Two link bushings ensure fluid, reliable movement over thousands of shifts, while aluminum is shaped and utilized for the clamp body The inner and outer plates are made with steel for optimal durability and strength. While moderately light and incredibly efficient, 105 components are widely considered to offer the best combination of price and performance. From the Di2 side of things, the FD-7150 features a sealed composite housing with a single SD300 e-Tube wiring port and the internal servo motor and electronics, which are all highly resistant to water, muck, and grime. All necessary Di2 alignment adjustments are made via the Function button on the rear derailleur.

Along with the release of the 12-Speed series components, Shimano also created their new generation e-Tube Project app which truly simplifies the set-up, shift button customization, battery level check, and diagnostic process, with a much more effective user interface for iOS and Android devices via the system's Bluetooth Low Energy communication channel. While an upgraded e-Tube PC site is still an option, most users find the app to be the easiest option available.