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daveaa-
If should, I actually build up a bike that somehow got an 6800 derailleur instead of 6700 like the rest of the bike, and doesn't cause chain rubs on the 11 speed derailleur.
Obviously shifting doesn't work but will look into this more; it could mean that you can get 6800 derailleurs and chainset, 6700 cassette and 4700 shifter to reduced the weight of the overall components, not that weight matter of course.
All this is theory BTW, I will inspect my 5800 derailleur nexf time I'm at work.
edscoble
Nope. Different cable pull.