Shimano 7970 dura ace di2 battery mount adapter
As an addition to the mechanical dura ace 7900 series the electronic dura ace 7970 will deliver state of the art technology that will give its users a revolutionary road riding experience di2 stands for digital integrated intelligence this innovative shift technology is still based on the shimano index system sis that has proved its superior gear changing characteristics over the years the big difference is that in this case the shifting action is provided for by electronics instead of