Shimano RD-R8050 Ultegra Di2 11-speed rear derailleur E-tube

Ultegra Shadow design with Di2 technology, shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear
Sleek appearance with Low profile Shadow design construction reduces risk of damage in a crash
Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift
The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts
Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts
High tolerance cold forged aluminium link plates and body construction is extremely light and durable
Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting
11-speed E-tube Di2 compatible
Speed
11 Speed