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.

Quick Facts

Feature	Specification
3-Port Option (SM-EW90-A)	Connects 1 pair of Di2 shifters to frame junction box via 3 SD50 E-tube wires
5-Port Option (SM-EW90-B)	Connects up to 2 pairs of Di2 shifters to frame junction box via 5 SD50 E-tube wires
Compatibility	OEM front wiring kit for Dura-Ace Di2 9070
Integrated Features	LED battery charge level indicator, Rear Derailleur adjustment mode, Internal Battery charging port
Firmware Requirement	All Di2 components on the bicycle require the same firmware version