FD-R8050, Ultegra Di2, Brazed On TypeThe SHIMANO ULTEGRA R8050 DI2 front derailleur delivers quick and smooth front shifting even under high pedalling torque. Programmed control of chain guide Full and semi synchronized shifting program System communication with rear derailleur, Programmed control of chainguide works for minimal chance of chain drop Quick and smooth front shifting under high pedaling torque SHIMANO Synchronized shift Redesigned to fit wider gear pitch without sacrificing