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ah yeah so the 'direct mount' bit is part of the rear mech which means frame/dropout doesent need any modification right?
Also trickling down is the so-called Direct Mount mounting interface, which hangs the derailleur further back from the frame than before for improved shifting and greater chain wrap across the cassette range.
https://cyclingtips.com/news/shimano-ultegra-r8000-mechanical-di2-derailleurs-specs-weight-price/
so with new shimano (R8000) you can have a DM variant of rear mech?