Shimano brings Synchro Shifting to current Ultegra 6870 and Dura-Ace 9070 groups - BikeRadar
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SYNCHRONIZED SHIFTING NOW AVAILABLE FOR ULTEGRA 6800 AND DURA AC | SHIMANO INFORMATION & NEWS
Shimano Di2 Synchro Shifting Explained - YouTube
What is Di2 synchro shift?
Shimano Di2 Synchro Shift for Triathletes - Fit Werx
Shimano Dura-Ace 9150 Di2 Synchro Shift: All you need to know | Cyclist
Synchro-Shift von SHIMANO - Was ist das eigentlich?
Shimano Dura-Ace 9150 Di2 Synchro Shift: All you need to know | Cyclist