Shimano EW-SD300 Wire

Shimano's SD-300 2nd generation Di2 e-Tube wires are the lighter, thinner, and carry more data and power faster than than the SD50 models. The wire and connecting ends are both thinner, and NOT directly compatible with pre 12-speed Di2 systems and components. The SD300 wire is designed for internal and external use and is also compatible with the EP8/EP800 electric bike power units and Shimano's STePS systems.