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Shimano SM-EW90-B E-tube Di2 Junction-A - 5 port

Shimano SM-EW90-B E-tube Di2 Junction-A - 5 port

The removal of traditional mechanical cables in favour of electrical wires not only eliminates poo...

Best current price£69.95from Merlin Cycles

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Merlin CyclesShimano Sm-Ew90-B 5 Port Di2 Junction Box
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£69.95
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Product Information

Full details

The Shimano SM-EW90-B E-tube Di2 Junction-A is designed for cyclists seeking a clean, reliable, and high-performance electronic shifting system. Its primary benefit is the elimination of traditional mechanical cables, providing effortless and consistent gear shifts regardless of environmental conditions. A key consideration is that it requires E-tube EW-SD50 wires, which are not included. This 5-port junction box acts as the central hub for your Di2 system, connecting shifters, a battery, and offering integrated battery level indication, a charging port, and a gear index setup switch.

All features

Model Part NumberSM-EW90-B
BrandSHIMANO

Extended Product Information

FAQs

What is the main purpose of the Shimano SM-EW90-B E-tube Di2 Junction-A?

It serves as the central control unit for Shimano's electronic Di2 drivetrains, connecting shifters, battery, and other components, while providing system status and charging capabilities.

Do I need separate wires for this junction box?

Yes, the Shimano SM-EW90-B requires Shimano E-tube EW-SD50 wires, which are sold separately.

How do I check the battery level?

The junction box has an integrated battery level indicator. Refer to the indicator lights to gauge the remaining battery charge.

Can I charge the battery directly through this unit?

Yes, the SM-EW90-B features an integrated charging port that allows you to charge the Di2 system's battery directly.

What does the gear index setup switch do?

This switch allows you to fine-tune the alignment of your gears directly from the shifter buttons, making micro-adjustments easily.

Is this compatible with all Shimano electronic shifting systems?

It is compatible with Shimano Di2 systems that use E-tube wiring. It is not compatible with older generations of Di2 or other electronic shifting brands.

Can I use handlebar extender shifters with this junction?

Yes, the SM-EW90-B is designed to allow simultaneous use of shift controls from both the primary handlebars and extenders.

Troubleshooting

Shifting is intermittent or fails.

Check all E-tube wire connections to the junction box and components to ensure they are securely seated. Verify the battery has sufficient charge. Perform a system diagnostic using Shimano's E-tube Project software.

Battery level indicator not functioning.

Ensure the battery is correctly connected and charged. Restart the system by disconnecting and reconnecting the battery. Update firmware using E-tube Project software if available.

Gear index setup switch is unresponsive.

Confirm that the switch is properly connected to the junction box. Reset the system by disconnecting and reconnecting the battery. Check for any firmware updates for the shifters and junction box.

System does not power on.

Confirm the battery is charged and correctly installed. Check all wire connections. Try connecting the charger to verify if the unit receives power.

Pros and Cons

Pros

  • Provides a cleaner cockpit by eliminating bulky mechanical cables.
  • Ensures consistent and precise shifting performance in all conditions.
  • Offers integrated battery monitoring and charging capabilities.
  • Allows for easy gear index adjustments without needing a separate tool.
  • Supports simultaneous use of shifters from multiple locations.

Cons

  • Requires separate purchase of E-tube EW-SD50 wires.
  • Adds a small component to the handlebar area.
  • Primarily designed for specific Shimano Di2 electronic shifting systems.
  • Initial setup may require a learning curve for users unfamiliar with Di2.

Setup, Compatibility & Care

Setup: The SM-EW90-B Junction-A connects to the Di2 system using Shimano's E-tube EW-SD50 wires. Ensure the shifters, rear derailleur, front derailleur (if applicable), and battery are connected to the appropriate ports on the junction box and the downtube junction (if used). Connect the charging cable to the integrated port for initial charging and firmware updates.

Compatibility: This Junction-A is compatible with Shimano Di2 electronic shifting systems that utilize E-tube wiring. It is designed to work with compatible Shimano shifters and derailleurs. Note: E-tube EW-SD50 wires are required and sold separately.

Care: Keep the junction box clean by wiping it with a dry or slightly damp cloth. Avoid using harsh chemicals or abrasive cleaners. Ensure all connections are secure and free from corrosion. Regularly check the E-tube wires for any signs of damage.

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