Shimano Ultegra Di2 offers the most precise and reliable shifting imaginable, at the push of a button. Adjust the derailleurs once, and the intelligent, auto-trimming system returns derailleurs to the same position every time. The intuitive and user-friendly design can be set up at home and accommodates any frame; new or old.
The Shimano Ultegra ST-6770 Front Wire connects the left and right shift levers to the rest of the system. This integrated wiring harness features a battery life indicator and unique derailleur adjustment, allowing you to tune the derailleur on the fly.
Special note: Due to differences in wiring, Shimano Dura-Ace Di2 and Ulegtra Di2 are not compatible.