Shimano Di2 FD-R8050 Ultegra Front Der Shimano has given the Ultegra groupset an updated design that utilizes all the new features of the new Dura Ace 9100 series at an affordable price. With Di2 electronic shifting you'll experience a whole new level of riding that cannot be provided through traditional mechanical shifting. The Shimano Di2 FD-R8050 Ultegra Front Derailleur delivers powerful and precise shift performance, even under high pedaling torque allowing you toput the power down as you simultaneously shift to the appropriate gear to meet the demand. Features Quick and smooth front shifting under high pedaling torque Programmed control of chain guide SHIMANO Synchronized shift Full and semi synchronized shifting program Redesigned to fit wider gear pitch without sacrificing shifting Shorter length of rear center (410mm) with O. L. D. 135mm System communication with rear derailleur, Programmed control of chainguide works for minimal chance of chain drop | Shimano | Ultegra Di2 Fd-R8050 Derailleur Braze-On, Di2 11-Speed