Shimano E-Tube Di2 Internal Junction-A - EW-RS910
ShimanoE-Tube Di2 Internal Junction-A - EW-RS910

Missing link.

The EW-RS910 E-Tube Di2 Internal Junction-A is the key element for connecting your Shimano Di2 drivetrian. It mounts in either a bar end or, in the case of some frames, in purpose-built ports in order to connect Di2's disparate bits and provide a conveniently accessible charging port.

  • The link to connect Di2 components
  • Easily accessible charging port
  • Shimano's Di2 is the peloton's most prominent drivetrain
  • Reviews
  • Q & A

Works great, makes Di2 even cleaner

  • Familiarity: I've used it several times

This thing deletes the junction box that hangs down under the stem, and makes an already clean front end even cleaner. It comes with mounts for both a bar end and frame port style install. The one thing to note, if you do not have a "di2" specific handlebar, you will have to drill a hole in the drops of your bar in order to get the wires to install the proper way.

I already have Di2, with a 5 port junction box (TT set up with shifters on aero bars and regular bars). Does this have enough ports to handle that? Also, do you need to have E-tube specific derailers or can regular Di2 DRs be retro fit to E-tube? Would the inline wireless unit be an easy way to retrofit to E-tube. Thanks.

Hey Jeff,

Unfortunately this does not have enough ports, there are only two in the back of it. You may be able to come up with some way of using a combination of this piece and the internal junction box (SM-JC41) but I haven't experimented enough to know with 100% certainty that would work.

Pretty Lights

  • Familiarity: I've used it several times

I was most impressed by the pretty lights on this junction box. When I switch syncro shift modes the green and red lights flash simultaneously and no matter the temperature or time of year I can't help but feel a bit of Christmas cheer.

The actual review: It installs easily with the y split root, allows you to perform adjustments and change syncro shift modes and provides a convenient charging port.