The Shimano Ultegra Di2 Rear Derailleur series is designed for optimal performance and reliability, ensuring a stress-free riding experience. With advanced electronic shifting technology, these derailleur models provide precise gear changes, allowing cyclists to focus on the road ahead. Whether you choose the short cage or medium cage version, both options are engineered to enhance all-day riding comfort while maint.Upgrade your cycling experience with the Shimano Ultegra Di2 Rear Derailleur series, where cutting-edge technology meets superior design for unmatched performance on the road.