The most advanced level of shifting technology: at the touch of a switch Dura-Ace Di2 is quick shifting, smooth, and effortless The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shifts Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold Shift switches are located in anergonomic easy to reach position on the side of the aero brake lever This switch positioning now gives the added advantage of being able to quickly shift while braking into corners and accelerating out previously not possible on a TT set up Brake levers are lightweight thanks to aero carbon fibre lever blades, carbon composite bracket body, and alloy fixings Brake lever pivot is positioned to increase power in combination with BR-7900 brake callipers The Di2 STIs are also compatible with the FlightDeck computer (SC-7900), measuring important data such as heart rate, altitude, cadence, gear position, battery indicator, and more Levers are supplied without electrical cables, as these need to be ordered separately to suit