Shimano Di2 E-Tube SM-EW90A 3-Port Junction Box
SM-EW90-B 5-Port Cockpit Junction Box connects Di2 shifters to the frame junction box via SD50 E-tube wires. The 3-port Cockpit junction box does not allow for the multiple satellite shifting options like the 5-port but it is a little lighter and sleeker.
- OEM front wiring kit for Dura-Ace Di2 9070 and Ultegra 6870
- LED battery charge level indicator
- Rear derailleur adjustment mode
- Internal battery charging port
All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions.