Combining 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-61-66 degree chainstay angle-Includes 1 SD300 port