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

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
  • Reviews
  • Q & A

Works great

  • Familiarity: I've used it several times

Great item that works as it should. Easy to use.

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?
Thanks
Frank

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!