The SM-EW90-B Di2 eShimano r is a junction box (Junction A) designed for 10- and 11-speed Shimano Di2 electronic drivetrains. Positioned beneath the stem, it connects the various components of the E-Tube system and centralises essential functions such as battery monitoring, derailleur adjustment and the recharging of compatible internal batteries. With its 5 E-Tube ports, it offers great flexibility for road, time trial, triathlon or gravel set-ups fitted with additional controls.

Shimano Di2

Its compact and lightweight design allows for discreet integration beneath the handlebars or stem. The SM-EW90-B is particularly popular for set-ups requiring multiple control points, such as the addition of sprint shifters or extension controls. It also features an LED battery level indicator and an adjustment button for fine-tuning the electronic derailleurs.

Key features

• Original Di2 ‘ Shimano ’ connection box.
• 5 E-Tube ports for extended connectivity.
• Compatible with Shimano EW-SD50 cables.
• Built-in LED battery charge indicator.
• Charging port for compatible internal batteries.
• Di2 derailleur adjustment button.
• External mounting beneath the stem.
• Manufacturer’s reference: ISMEW90B.

FAQ

What is the SM-EW90-B Shimano unit used for?

It is the main connection point for the Di2 system and links the controls, derailleurs and battery to the Shimano E-Tube network. It is also used for charging and adjusting the system.

What is the difference between the SM-EW90-A and the SM-EW90-B?

The SM-EW90-A has 3 ports, whilst the SM-EW90-B has 5, offering more options for connecting additional shifters or triathlon extension cables.

Is the unit compatible with Shimano Di2 satellite controls?

Yes, its five ports allow you to connect additional shifters, such as sprint shifters or time trial shifters, depending on the bike’s configuration.

Are E-Tube cables supplied?

No, the Shimano EW-SD50 cables required for connection must be purchased separately.