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. Small, sleek and lightweight front derailleur Frontal area is smaller than previous designs to reduce aerodynamic drag Top gear teeth capacity: 50 54t Product Specifics Double or Triple: Double Drivetrain Speeds: 12 Derailleur Capacity: 16 Front Derailleur Clamp: Braze on Front