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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-
Please keep us posted. I'm looking to upgrade my partners Croix de Fer to full hydro, but she doesn't ride enough to justify anything above Tiagra. As I understand the new Tiagra doesn't work with the 4600 so I would have to by the whole groupset. I could just use the Ultegra 6800 bits that I have in my spares box instead.
pit
Isn't the 4700 pull is similar to 11 speed? Shouldn't it work With 6800 or 5800?