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 become more compact in its dimensions is thus not only faster than ever before, but also guarantees highly precise functionality under all conditions.Material: base, bracket: aluminium (painted) chain guide: steel (plated) outer link: aluminium (painted) inner link: steel (painted) Compatibility: STI lever: ST-R9250, ST-R9270, ST-R9160, ST-R9180, ST-R8150, ST-R8170, ST-R8060 crank: FC-R9200, FC-R9200-P, FC-R8100, FC-R8100-P chain: CN-M9100, CN-M8100, CN-M7100, CN-M6100 accessory: SM-AD91 adapter