Shimano FD-R7150 Front Derailleur 12-SpeedPrecise, Coordinated Front ShiftingElectronic shifting is the next stage up from mechanical shifting. If you're looking for the crispest and most precise shifting out there, you'll want to get an electronic drivetrain. The Shimano FD-R7150 Front Derailleur lets you change from the big to small chainrings, or vice versa, whenever you like while minimizing the risk of a dropped chain. Similarly, you can perform rear shifts without the need to trim the front derailleur to avoid chain rub. It features a top gear teeth capacity of 50-52T, programmed chain guide control by automatic trim, and a manual, full, and semi-synchronized shifting program. FeaturesFull and semi-synchronized shifting functionscan be selected using the E-TUBE appPerform rear shifts without the need to trim the front derailleur to avoid chain rubMinimizes the risk of a dropped chain | Shimano | FD-R7150 Font Derailleur 12 Speed FRONT DERAILLEUR, FD-R7150, 105, FOR REAR 12-SPEED, DOWN-S