Technical FAQ: The intricacies Di2 Synchro-Shift - VeloNews.com
How to Upgrade Shimano Dura-Ace 9070 and Ultegra 6870 Di2 to Synchro Shift
Shimano Di2 : Fingers On. Di2 Review
Shimano Makes Electronic Shifting More Affordable With Deore XT Di2, Offers More Drop Bar Configurations and Bluetooth Connectivity - Cyclocross Magazine - Cyclocross and Gravel News, Races, Bikes, Media