Shimano FD-R8150 Front Derailleur Ultegra Di2 12-Speed Braze-OnShimano Ultegra Di2 FD R8150 front derailleur The Di2 actuators in the front and rear derailleurs of the current Ultegra series enable a significantly higher movement speed for a shorter movement time when changing gears and correspondingly rapid shifting processes. The Shimano Ultegra Di2 FD R8150 front derailleur speeds up the shifting process by 45 % compared to the previous generation Dura Ace model FD R9150. The front derailleur which has also