The shimano dura ace di2 dual integrated intelligence features the most enhanced level of shifting technology put to the test in competition and used in victories by pro riders in every condition including the 2012 tour de france team sky di2 has been made 11 speed for 2013 all new 9070 shifters features improved feedback and ergonomics this provides simple access to the shift buttons at the top of the hoods clean wiring is possible with the single wire e tube connections along with si