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Out of general interest I've been getting my head around DRD derailleurs and found this explanation on the Orange website
The hanger takes the place of the upper link of a conventional rear derailleur, connecting the frame to the upper pivot of a DRD specific mech and eliminating the weakest part of the system.
The thing is, to my eye, it just looks as though the system consists of a new hanger, I can't see how the derailleur is directly connected to the frame. Am I missing the point?
You remove the b link from the mech and attach the mech at the b pivot to the longer style mech hanger.
Thanks Nixie, that makes sense now.