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actually, it is just as simple as changing the brake and lever. it will shift 9070, 6770, and 6870. the levers are dumb, all indexing is done from the rear derailleur.

1 year, 7 months ago on First Ride and Review: Photo Gallery of Shimano’s R785 Hydraulic Disc Brake and Ultegra 6870 Di2 11-speed