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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.
Reviewed by 1 customer
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Comments about Shimano Di2 SM-EW90 Junction Box A:
Super easy to attach to stem. Except if you're super drunk. I hurt my finger. The next morning I attached it with ease.