SHIMANO Dura-Ace Di2 9150 front derailleur, now featuring the "Synchronized Shift" function introduced by the Japanese manufacturer in its latest Dura-Ace electronic transmission systems! With the aim of simplifying gear management, Synchronized Shift allows the rider to manage only his right-hand drive ("Full Synchro Shift"), with a simple change of sprocket on the cassette automatically influencing the selection of the front chainring, to preserve chain line and cadence. Semi Synchro Shift" mode is also available: only the chainring control is managed, and the chain is automatically aligned ...