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ShimanoE-Tube Cockpit Junction Box - SM-EW90 A/B

Sale 38% Off$69.95 - $89.99

Item # SHI0650

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  • One Color, 3 PORT ($69.95)
  • One Color, 5 PORT ($89.99)
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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.

  • A junction box that lets you expand shift switch placement
  • Mounts below the bar for easy installation and maintenance
  • Includes charging port for the SM-BTR2 Di2 battery
  • Available in three- and five-port versions
  • Compatible with Dura-Ace Di2 9070 drivetrains

California Proposition 65


This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Tech SpecsSize
Tech Specs
Shimano Di2
Recommended Use
road cycling
Manufacturer Warranty
2 years


Di2 Reference Guide
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 & Wire ConfigurationsBatteryBattery ChargerBattery MountJunction AJunction B

External Battery

with External Routing




SM-EW90 A/B 3/5 port


External Battery

with Internal Routing




SM-EW90 A/B 3/5 port


Internal Battery

with Internal Routing




SM-EW90 A/B 3/5 port


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.

Junctions: 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 ChartSML
Down Tube Wire




Front Derailleur Wire




Rear Derailleur Wire




Battery Wire




Note: E-Tube Wire Length Suggestions are an approximation.
E-Tube Wire Frame Size Guide




Frame Size 47 - 52cm 53 - 56cm 57cm+
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.

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    Product performs as advertised with no problems whatsoever. I am new to DI2 and this in addition to the other components are easy to read up on and understand.

    Plugs, plugs, plugs

    • Familiarity: I've put it through the wringer

    A place for all of your Di2 plugs. Oh, and it's pretty key to making the system work.

    Perfect Compliment to internal batteries

    • Familiarity: I've put it through the wringer

    Not only is this thing the "brain" of the system, it also serves and the charging port for the internal battery. I like how Shimano made this box sleek and not terrible to look at. Also allows for adjustment on the road also.

    It's a most

    • Familiarity: I've put it through the wringer

    Fits great on the bike, connects with no problems. Make sure you use the connecter tool so you don't mess up you cables. Again, its a most, since this is what you need to connect you levers and the rest of the cables to go to your di2 derailleurs and battery. The charging port very easy to access too.

    Critical Piece

    • Familiarity: I've put it through the wringer

    Things brings together your Di2 system. The 5-point option is great if you need to install remote shifting at the end of your aero bars. This also hosts your battery warning light. Plug it in once a month or so!

    Critical Piece

    More than just the junction box

    • Familiarity: I've put it through the wringer

    Keep in mind when considering the cost of such a small item that it not only gets the connections made, but also functions as a battery warning light, facilitates micro-adjusting the derailleur positions and is also where you plug in to charge up.

    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.

    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?

    I've got the same question about the wire length. Same 400mm handlebar. Here's my measurement based on SM-EW67A wires:

    300mm could be too short for bigger hadlebars (or strange levers position). 350mm would be little loose. 300mm seems to be just right for me. Here's the picture of 300mm wire

    I've got the same question about the wire length. Same 400mm handlebar. Here's my measurement based on SM-EW67A wires:
300mm could be too short for bigger hadlebars (or strange levers position). 350mm would be little loose. 300mm seems to be just right for me. Here's the picture of 300mm wire

    Is this compatible with ultegra?

    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?

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

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

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

    Best Answer

    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!