The Shimano XTR M9050 Di 2 Triple Front Derailleur is a Dyna-Sys 11-speed shifter with guaranteed smooth shifting thanks to a microchip communication link with the gear levers. The rear derailleur is also to designed to trim the front derailleur meaning that the cage moves in response to the position of the rear derailleur on the cassette to make sure there is no chain rub or obstructions for the chain, allowing you to concentrate on your ride. One of the biggest differences between mechanical & Di 2 is how much quicker & effortlessly smoother the shifting is on the front chainrings is, even under load. The removal of traditional mechanical cables in favour of electrical wires means no more poor shifting due to contamination, corrosion or stretched cables as well as effortless & precise gear shifting no matter what the weather. The Di 2 is also Synchro shift compatible meaning a single shifter can control both front & rear shifting which can be fully custom tuned to your riding preferences.