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

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

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    Warning: California Proposition 65

    California Proposition 65

    Warning:

    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 Specs

    Compatibility:
    Shimano Di2
    Claimed Weight:
    20g
    Manufacturer Warranty:
    2 years

    Always at your fingertips.

    The Shimano E-Tube Cockpit Junction Box works with the Dura-Ace Di2 9070 groupset to enable supplemental shifting positions so that the ease of electronic shifting is always at your fingertips, no matter what hand position you favor.

    The E-Tube mounts just below your handlebars and functions as a junction box so that no additional wiring is needed to add a second set of shifters to your bars. Now you can keep your hands in the drops to maximize aerodynamics on long, flat stretches and up high for greater control. And for even more options, the E-Tube Cockpit Junction Box comes in two configurations: a three port and five port. To keep you running, both versions feature a charging port for the new internal 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

    Shimano

    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-BTR1

    SM-BCR1

    SM-BMR2

    SM-EW90 A/B 3/5 port

    SM-JC40

    External Battery

    with Internal Routing

    SM-BTR1

    SM-BCR1

    SM-BMR2

    SM-EW90 A/B 3/5 port

    SM-JC41

    Internal Battery

    with 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.

    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

    700mm

    750mm

    950mm
    Front Derailleur Wire

    300mm

    350mm

    400mm
    Rear Derailleur Wire

    500mm

    550mm

    600mm
    Battery Wire

    300mm

    350mm

    400mm
    Note: E-Tube Wire Length Suggestions are an approximation.
    E-Tube Wire Frame Size Guide

    S

    M

    L

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