New Arrival
Di2 Junction A SM-EW90-B 5 Port
$188.99
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 |
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