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Shimano brings Synchro Shifting to current Ultegra 6870 and Dura-Ace 9070 groups - BikeRadar
Shimano XTR Di2 Synchro Shift Review
How to Setup Synchronized Shifting on your Shimano Equipped Di2 Bike - YouTube
SYNCHRONIZED SHIFTING NOW AVAILABLE FOR ULTEGRA 6800 AND DURA AC | SHIMANO INFORMATION & NEWS
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How to Upgrade Shimano Dura-Ace 9070 and Ultegra 6870 Di2 to Synchro Shift
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