For the best results Shimano have specially developed the Ultegra Di2 cables to make certain that the signal goes from the shifter to the derailleurs, the reliability of the electric cable has been proven by repeated field tests in various riding conditions, including extreme temperatures, rain, mud, and cobble stone roads. Reliable and secure water resistant connectors. The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts.
Specially developed the Ultegra Di2 cables
Better signal capabilities from the shifter to the derailleurs