Shimano Di2 Junction A SM-EW90-B 5 Port

The Shimano SM-EW90 E-Tube Cockpit Junction Boxes link your Di2 shifters to the main frame junction box using SD50 E-tube wires. Serving as the OEM front wiring kit for Dura-Ace Di2 9070, this component streamlines your electronic shifting setup.

This functional unit features an integrated LED battery charge level indicator, a rear derailleur adjustment mode, and an internal battery charging port. All connected Di2 components require matching firmware versions to prevent malfunctions during your ride.

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