Expand your secondary shift options with the Shimano Di2 SM-EW90 Junction Box. The junction box mounts directly below the handlebar, making wiring up a set of secondary shifters easy and making it all possible with minimal cabling. Available in a 3 or 5 port version, the SM-EW90 is the gateway to the ultimate Di2 expansion.
Expands Di2 systems to accomodate secondary shift buttons
3 or 5 port version
Acts as a charging port for Shimano's internal SM-BTR2 Di2 battery (not included).
Indispensable part if you are going to assemble DI2 in your bike. Attention to the number of pins available: 3 holes to shifters and a cable or 5 holes if you want to connect other accessories like sprint or climbing shifters
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