Harness the power.
This E-Tube Di2 Front Wire Harness kit is for Ultegra 6770 and Dura-Ace 9070 Di2 components. It features thinner, more discreet cables and a smaller junction than what you'll find on previous-generation Dura-Ace 7970 Di2 parts.
To outfit your Ultegra or Dura-Ace 9070 Di2 bike, you'll need five distinct wire sections -- front wire harness, downtube, front derailleur, rear derailleur, and battery. Unlike the other cables, this Front Wire Harness only comes in one length. It's the portion that connects the two shift levers to the A junction, which is included with this wire kit. And whether or not you run your other wires inside or outside the frame tubes, this is the part that is always nicely hidden underneath the handlebar tape.
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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.
Reviews & Community
Not compatible with DA 9070
- Familiarity: I returned this product before using it
While im sure this junction box works just fine, it will not work with 11s components anymore thanks to a firmware update from Shimano. If you can find some older 6870 or 9070 gear that was sold 1-2 years ago and has never been updated, there is a chance that it MIGHT work. This junction did work with a 6870 bike I have but would not work with a newer 9070 bike I was currently building. So yea...no longer 11s compatible unless you are mating it to older parts.
Outfitting my new frameset with Ultegra Di2 (6870).
Is this part applicable?
SHIMANO E-TUBE DI2 FRONT WIRE HARNESS (Item # SHI0393)
Or do I need to separately purchase SM-EW90-A and 2 EW-SD50 cables? If so, what size cables are normally used. I've got a 56 frame with 42 handlebars and a 110mm stem.