Shimano Dura-Ace FD-R9250 Di2 Front Derailleur - 2x12-Speed, Braze-on, Down Swing, For 50-55t Max, Black/SilverDespite its smaller, lighter design, the Shimano Dura Ace FD R9250 offers ultra fast front shifting. Fast Di2 shifting performance Smaller, sleeker, lighter Frontal area is smaller than previous designs to reduce aerodynamic drag Top gear teeth capacity: 50 55t Product Specifics Double or Triple: Double Drivetrain Speeds: 12 Derailleur Capacity: 16 Front Derailleur Clamp: Braze on Front Derailleur Cable Pull: Electronic Front Der Shifter