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. 61 66 degree chainstay angle Includes 1 SD300 port Fast Di2 shifting performance Smaller, sleeker, lighter Frontal area is smaller than previous designs to reduce aerodynamic drag Top gear teeth capacity: 50 55t Item Specifications Derailleur Capacity 16 Double or Triple Double Drivetrain Speeds 12 Front Der Shifter Compatibility Shimano Road Di2 Front