-Dura-Ace Di2 7970 package will include wired STI Dual Control levers,
-front and rear derailleurs and a battery pack,
-the rest will be filled in with standard 7900 componentry.
-Even with the additional electronic hardware,
-the complete Di2 group will still be approximately 113g lighter than
-the current 7800 groupset - but around 68g heavier than the standard
7900 mechanical.

-the complete Di2 group will still be approximately 113g lighter than
-the current 7800 groupset - but around 68g heavier than the standard
7900 mechanical.