Experience easy and precise shifting with the Shimano Ultegra RD-R8050 rear derailleur, featuring Di2 technology. A light touch is all it takes for instantaneous gear selection. The sleek, low-profile Shadow design minimizes crash damage risk. Automatic programmed motion ensures quick, smooth, and effortless shifting. Replacing traditional mechanical cables with electrical wires eliminates shifting issues caused by contaminants, corrosion, and stretching, providing a seamless experience. The derailleur includes a saver (fuse) function to protect internal components from strong impacts. Constructed with high-tolerance, cold-forged aluminum link plates and body, it is both lightweight and durable. Four self-lubricating, micro-machined, fluorine-coated link pivot bushings ensure low-friction shifting. It is compatible with 11-speed Di2 systems.