EW-RS910

Brand: Shimano

Built-in junction A of the Shimano Di2 11-speed system: it sits in a drop-bar end or inside the frame rather than hanging under the stem. Two E-Tube SD50 ports and a charging port fit into 11 g, with the same battery-level, gear-position and adjust-mode functions. This is the part that made clean Di2 cockpits with no visible box possible.