Shimano E-Tube Cockpit Junction Box - SM-EW90 A/B $139.95
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.
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||Battery Charger||Battery Mount||Junction A||Junction B|
w/ External Routing
|SM-BTR1||SM-BCR1||SM-BMR2||SM-EW90 A/B 3/5 port||SM-JC40|
w/ Internal Routing
|SM-BTR1||SM-BCR1||SM-BMR2||SM-EW90 A/B 3/5 port||SM-JC41|
w/ Internal Routing
|SM-BTR2||SM-BCR2||SM-EW90 A/B 3/5 port||SM-JC41|
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.
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.
|Down Tube Wire||700mm||750mm||950mm|
|Front Derailleur Wire||300mm||350mm||400mm|
|Rear Derailleur Wire||500mm||550mm||600mm|
E-Tube Wire length suggestions are an approximation.