and shift linkage, and all of the factory functions like cruise control and sport mode work perfectly fine, too. Given how simple PSS has made this enticing swap, it wouldn’t be surprising to see more ...

Ultegra Di2 and 105 Di2 are also electronic, before you move into Shimano's mechanical groupsets. These go from 105, which is 12-speed, all the way down to Claris, which has eight speeds.