That massively over specced Firefly "commuter" used Di2 with custom buttons, which would suggest it's just a case of closing the appropriate circuit to operate the shift. In which case they would be easier to manufacture than mechanical levers (albeit more complicated to fit).
That massively over specced Firefly "commuter" used Di2 with custom buttons, which would suggest it's just a case of closing the appropriate circuit to operate the shift. In which case they would be easier to manufacture than mechanical levers (albeit more complicated to fit).