Designed to give you smooth and fast shifting the shimano dura ace di2 fd 9070 front derailleur 11 speed features electrical wires for effortless operation boasting a high tolerance cold forged aluminium and composite construction it also moves in response to the position of the rear derailleur on the cassette to prevent chain rub and reduce noise lm features shimano dura ace di2 fd 9070 front derailleur 11 speed provides smooth and fast shifting electrical wires for effortles