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Shimano �E-Tube Cockpit Junction Box - SM-EW90 A/B

Sale $98.99 - $99.99 $139.95 29% off

Item # SHI0650

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  • One Color, 3 PORT ($99.99)
  • One Color, 5 PORT ($98.99)
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Item # SHI0650

Add those shifters.

With the introduction of the Dura-Ace Di2 9070, the door was fully opened for secondary shifter options. In addition to their standard ST-9070 shifters, many riders are now opting for supplemental shifting positions to reflect the race course for the given day. It's an option many Shimano-sponsored riders are taking advantage of -- strategically placing advanced electronic shifting technology literally at their fingertips.

In the Spring Classics this year we saw many riders running Shimano's top mounted shifters, as hands are often positioned up high on the bars for increased control over the demanding road surfaces. Similarly, sprint-specialists who spend most of their time down in the drops of their bars will request that mechanics add Shimano's slick sprint shifters to their cockpits on flat race stages.

Due to the myriad of shifting options that have presented themselves with Shimano's new Di2 group, the Japanese engineers created its new E-Tube Cockpit Junction Box to handle additional componentry. The small junction box mounts directly below the handlebar, and makes it so that no additional wiring or setup procedure is required to add your supplemental shifters.

The Shimano E-Tube Cockpit Junction Box is available in two versions: the SM-EW90-A, with three ports, and SM-EW90-B, with five ports. Combined with the three ports on the back of each STI lever, both boxes provides a huge range of setup options. Additionally, both versions of the new E-Tube Cockpit Junction Box feature a charging port for the new internal SM-BTR2 Di2 battery.

  • Three- and five-port versions
  • Dura-Ace Di2 compatible

Tech Specs

Shimano Di2
Recommended Use:
road cycling
Manufacturer Warranty:
2 years
Actual Weight:
One Color, 3 PORT: 10g; One Color, 5 PORT: 10g

Size chart


Di2 Reference Guide


Note: This reference is meant to be used as a guide for creating a Shimano Di2 drivetrain package. For further assistance please feel free to give us a call.


Battery and Wires:

Our Shimano Di2 packages are built for three standard configurations based on battery location and wire routing. First, you'll need to determine if your frame uses an internal or external battery mount, and whether the routing is either internal or external. Below is a guide for which battery, charger, mount, and junction boxes are required for your configuration.

Battery and Wire Configurations
 BatteryBattery ChargerBattery MountJunction AJunction B

External Battery

w/ External Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC40

External Battery

w/ Internal Routing

SM-BTR1 SM-BCR1 SM-BMR2 SM-EW90 A/B 3/5 port SM-JC41

Internal Battery

w/ Internal Routing

SM-BTR2 SM-BCR2   SM-EW90 A/B 3/5 port SM-JC41

Battery Mounts:

The SM-BMR2 battery mount is available in three configurations -- Long External, Short External, and Long Internal. Both Long versions are to be mounted using the bottle cage mounts, while the Short version is designed for Di2-specific frames with either a chainstay or down tube mounting location.



There are two junctions needed for completing your Di2 build -- A and B.  Junction A, SM-EW90, is located at the handlebars and available in both three- and five-port options. The three-port option is intended for standard shifting with a left and right hand shifter. If you have the intention of using Shimano's satellite sprint shifters, or a combination of time trial shifters and shifter/brake levers, the five-port junction box will be the necessary selection.

Depending on your frame specification, Junction B (SM-JC40 or SM-JC41) is located either internally or externally at the bottom bracket area. Accordingly, SM-JC41 is designed for frames with internal wire routing, while SM-JC40 is intended for external wiring options.


E-Tube Wires:

For your convenience, we've created wire packages for your Di2 build kit in the sizes Small, Medium, and Large. Below, you'll find which wire lengths are included in each kit. Additionally, we've recommended a kit size based on your frame size.

 E-Tube Wire Length Chart
Down Tube Wire 700mm 750mm 950mm
Front Derailleur Wire 300mm 350mm 400mm
Rear Derailleur Wire 500mm 550mm 600mm
Battery Wire 300mm 350mm 400mm


 E-Tube Wire Frame Size Guide
Frame Size  47-52cm 53-56cm   57+cm

Please Note:

E-Tube Wire length suggestions are an approximation. 

Reviews & Community


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Here's what others have to say...

Avg. ride time: 13h 26m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

great product

  • Familiarity:I've put it through the wringer

self explanatory really. It does a great job and works far better than the old ultegra one.

Unanswered Question
Avg. ride time: 9h 7m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

I have a few questions:
1. Does it come with the attachment kit to the stem?
2. What wire length do I need to connect to the shifters at a 400mm handlebar?

Avg. ride time: 30m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Is this compatible with ultegra?

Responded on

Yes! The only group it won't work with is the DA7090 di2

Do all the ports have to be filled for the junction box to work? Meaning could you run a standard shifting setup off the 5 port model having the option of adding sprint shifters later?

Responded on

Nope, You can buy the 5 port and only use 3. This will let you add remote shifters or other accessories down the road.

Avg. ride time: 2h 29m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Does the E-tube cockpit junction come with...

Does the E-tube cockpit junction come with the Di2 wires for the shifters?

Best AnswerResponded on

Hey Eric-

The older junction boxes use to have E-tubes that were hardwired in. Now, this is only the 3/5 port junction box (the option is yours) with no included E-tubes,

Let us know if you have any more questions on this!