The new Di2s are all wireless 12spd(11-34), The only things inside the frame are the hydraulic lines and some wire for the derailleur action in the lower seat tube and chain stay. The bar shifters have little watch batteries, The shifters also communicate w/ my Garmin's showing what gear is selected, There a whole little network between bike computer, wrist watch, phone, shifters and Varia rear radar/light/cam
I have wired Di 2 Dura ace on my old soon to be retired Ti w/ semi- compact crank and 11 speed 11-32 which has ben my fav compared to compact crank 11-28 on my Synapse
Used w/ a semi-compact crank the 11-34 gear spread is awesome
a bud picked up his #22 Drifter this summer, It's a gravel bike but setup similar to mine
