The shimano xtr m9050 di2 shifter makes changing gear easy and precise just a light touch of the super light short stroke lever is sufficient for the front or rear derailleur to instantaneously select the correct gear 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 and precise gear shifting no matter what the weather these shifters are synchro shift compatible mea