Frame/Handlebar Junction A

The EW-RS910 junction box replaces the more traditional below the stem junction SM-EW90. It is mounted either in the handlebar end or somewhere built into the frame.

The junction box has two E-tube ports to connect it to the rest of the system, a charging port and a button used to check battery status and change settings on the fly.

You could replace this junction with the mountain bike System Information Display (XT SC-M800 | XTR SC-M9051), if you wanted to. This Information Display functions as a Junction A with three e-Tube ports, a display and features Bluetooth/ANT+ connectivity.


Details & specifications

Shimano model codeEW-RS910
Shimano model nameFrame/Handlebar Junction A
Weight11 g
SeriesUltegra 6770, Ultegra 6780, Ultegra R8000, DURA-ACE 9070, DURA-ACE R9150
Downloads EW-RS910 manual
View on Amazon (new tab)  |  eBay (new tab) Chain Reaction Cycles (new tab)

Shopping links

Are you looking to upgrade your bike using this component? We've added shoppings links to this component's Amazon and eBay pages. Click the images below to view the Amazon product page or eBay search results.

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Installation and cable routing

You would usually install this junction box together with the EW-JC130 Y-connector cable. Depending on where you put it on the bike, there areĀ  several ways to do cable routing.

Junction A (EW-RS910) in handlebar

EW-RS910 Junction box in the handlebar

When the EW-RS910 is installed in one of the handlebar ends it is connected to both shifters using the EW-JC130 Y-connector cable. This cable connects two components to the rest of the system. In the image above the left shifter is connected to one end of the Y-connector. The EW-RS910 junction box is connected to the other end. Then, to connect everything to the rest of the system, the short cable of the Y-connector is plugged into the EW-WU111 Wireless Unit.
Note that the wireless unit is optional, using the EW-JC200 inline 2-port junction instead will work just as well.

Junction A (EW-RS910) in the frame

EW-RS910 junction in the frame

Some bike manufacturers have built dedicated EW-RS910 spots into their frames - usually somewhere on the downtube. These usually look nice and clean, but cable routing is slightly different from the regular handlebar bar-end junction. In this setup the EW-JC130 Y-connector directly connects to both shifters. It then connects to either an EW-WU111 wireless unit or the EW-JC200 2-port inline junction, which is connected to the EW-RS910 junction A (see upper half of image).

EW-RS910 image