I don't get it. A lot of 2013 tt bike features Ultegra Di2 derailleurs with both DA Di2 brake levers and shifters. So, does it mean that a cable makes that possible ????
http://www.culturevelo.com/...loha_Ultegra_Di2.jpg
http://www.culturevelo.com/...loha_Ultegra_Di2.jpg