Can I just use 6870 mechs and it'll be an 11 speed system?
yes
How about if I wanted 1x11? How about if I wanted XTR mech? Di2 is confusing
Answer is eTap
How about if I wanted 1x11? How about if I wanted XTR mech?
How about if I wanted 1x11?
How about if I wanted XTR mech?
Both fine. They'll work with anything Di2 except the original 4 wire 7970. They'll even work with Alfine Di2 if you're that way inclined.
@PhilDAS started
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yes