SM-EW90-B
Brand: Shimano
Five-port external junction A of the Shimano Di2 11-speed system, mounted under the stem. Its two extra E-Tube SD50 ports over the SM-EW90-A allow a second pair of controls — extension-bar, sprint or climbing switches — to be plugged in without adding another box. It offers the same display functions and charging port, and weighs 13 g.
| Type | Electronic shifting accessory |
|---|---|
| Model years | since 2013 |