Sorry, this item is Out of Stock and cannot be purchased at this time.
Shimano Ultegra Di2 RD-6770 Rear Derailleur
Shimano broke the mold with their Dura-Ace Di2 group. Effortless shifting, instant engagement, unparalleled performance. Well, now you can get electronic shifting without shelling out all that dough. The Ultegra Di2 group is a more affordable version of the Dura-Ace Di2 group, so you can enjoy many of the benefits, without the high price tag. This rear derailleur is also equipped with a built-in safety function and recalibration function in the event of impact, which keep your drivetrain working just it was the day it left the bike shop.
The integrated CPU keeps track of both front and rear derailleurs to optimize shifting performance
Servo motor ensures that every shift is identical, so you get reliable performance
Programmed motion speeds up shift times and prevents chain drop
Built-in safety function automatically shifts the derailleur inward under impact to prevent damage to the component
In the event of impact, the rear derailleur recalibrates for perfect alignment with the cassette
Now compatible with up to a 28T rear cog for better functionality with compact cranks than other designs
Short cage design is compact
Must be used with Shimano Ultegra Di2 Rear Derailleur Wire Kit, Shift Levers and related system components (sold separately)
Not compatible with Dura-Ace Di2 7900 levers or wire kits