With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear. 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. Full synchronized shifting programable, Synchro shift compatible meaning a single shifter button either side can control both front and rear shifting which can be fully custom tuned to your riding preferences. Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold. TT bar STI use single shift buttons either side. Brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding. Finely tuneable reach adjusters for the levers enable custom fitment for all hands. Levers are supplied without electrical cables, as these need to be ordered separately to suit. For use with E-tube electric cables.