Shimano Ultegra FD-R8150 Di2 Front Derailleur - 2x12-Speed, Braze-on, Down Swing, For 50-54t Max, Black/SilverCombining Shimano's Di2 platform and the road incarnation of Hyperglide+, the Ultegra FD R8150 front derailleur shifts between chainrings with the fast and seamless action. Product Details: Frontal area is smaller than previous designs to reduce aerodynamic drag Small, sleek and lightweight front derailleur Top gear teeth capacity: 50 54t Specifications: Derailleur Capacity: 16 Double or Triple: Double Drivetrain Speeds: 12 Front Der Shifter