Di2 Compatibility

Hello! need advise on Di2,

shifter ultegra 6870
Front Derailleur 7970 ext battery
Rare Derailleur 6770 ext battery

Would these combinations are compatible to each other?

Welcome to the Forum

It looks like your shifters and rear derailleur will work but not the front


That is just what I thought… thank you so much, 7970 really causes pain in the ass.

As I understand it you cannot mix 10 speed and 11 speed di2, though I’ve had good luck mixing different generations of dura ace and ultegra, 11 speed di2.