Shimano SM-EW90-A Di2 3-Port Junction Box

The Shimano SM-EW90-A wiring junction is the Di2 junction box that connects the shifters and down tube cable at a single point. It is for anyone fitting or replacing a Shimano electronic groupset.

• Connects both shifters and the frame wiring via 3 E-Tube ports
• Also has a charging port for the groupset battery
• Lightweight at just 10 g, and mounts beneath the stem
• Compatible with Dura-Ace, Ultegra, GRX, XTR, XT Di2 and Alfine/Nexus Di2
• Check your groupset: not compatible with Dura-Ace 7970 and Ultegra 6770

Technical specifications

• Weight: 10 g
• Ports: 3 E-Tube ports and 1 charging port
• Connections: one port for the down tube wiring, two for the shifters
• Compatible cables: E-Tube and EW-SD50
• Compatibility: Dura-Ace Di2 9070 and R9150, Ultegra Di2 6870 and R8050, GRX Di2 RX815, XTR Di2 M9050 and XT Di2 M8050, Alfine/Nexus Di2
• Not compatible with: Dura-Ace 7970 and Ultegra 6770
• Mounting: External, beneath the stem with a strap or clip, for standard handlebars
• Package contents: 1 x SM-EW90-A junction box, 2 x mounting straps, 1 x clip

Founded in 1921 in Sakai, Japan, by Shozaburo Shimano, Shimano is still based in the same city today. For cyclists, it makes drivetrains, brakes, wheels, pedals and cycling shoes. Its history in bicycle components began with the production of freewheels in 1922.