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SHIMANO's SM-EW90-A 3-port Junction A mounts neatly to the bike stem and connects with E-TUBE wires from DI2 shifters and the downtube junction wire. The SM-EW90 junction box features an integrated battery level indicator, charging port, and gear index setup switch.
| MODEL NO | SM-EW90-A |
| SERIES | DURA-ACE 9070 Series |
| Average weight | 10 |
| Type | External type |
|
Position
|
Under stem |
| Compatible system | E-TUBE | E-TUBE |
| Compatible electric wire | EW-SD50 - EW-SD50 |
| Firmware update by E-TUBE PROJECT | ✔ |
| SD50 port (pcs) | 3 |
| SD300 port (pcs) | 0 |
| SD50 connector (pcs) | 0 |
| SD300 connector (pcs) | 0 |
| Connector for remote sprinter shifter (QTY) | 0 |
| Port for remote sprinter shifter (QTY) | 0 |
| Charging port (pcs) | 1 |
| Function|Gear position | ✔ |
| Function|Di2 Battery level | ✔ |
| Function|Adjust mode display | ✔ |
| Function|E-TUBE connection | ✔ |