Shimano Di2 Junction A SM-EW90
The new style Shimano Di2 Junction box A can be used on both Ultegea and Dura-Ace Di2 systems and is a component for using the internal style battery.
Mounted beneath the stem with rubber harness that is included the Junction A can be mounted to any stem. Junction A has a charging port for internal battery. Charger not included.
3 Port for conventional road set up including sprint and climbing switch.
5 Port for Time Trial and Tri set up with aero extensions on both drop and flat bar.
Shimano Dura-Ace Di2 9070 Frame Wiring Options
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