System Information Display - Junction A

SC-M9051 - System Information Display - Junction A image

The SC-M9051 System Information Display shows you what gear you're in, has a battery level indicator, charging port, synchronized shift mode display and also doubles as a Junction A - it has 3 e-Tube ports for you to connect components to it. The displays lets you charge the system and also connect to it using Bluetooth or ANT+.

It supports both 31.8mm and 35mm diameter handlebars.

If you're thinking of using this display on your road bike to replace your Junction A (SM-EW90 / EW-RS910) and Wireless Unit - you can! Be aware that you can only have one component with wireless/bluetooth functionality connected. If you connect both this and a Wireless Unit the Di2 system won't function.

Functionality wise this unit is identical to its cheaper XT sibling, the SC-MT800. The casing is not, but that is the only difference.

Current generation battery or mount required

Just like the SC-MT800 display, this SC-M9051 requires a modern battery (BT-DN110) or battery mount (BM-DN100). The display will not work with the older batteries.

Synchronized shifting on mountain bikes

If you want to use synchronized shifting on your mountain bike the usual requirements apply - you need either a BT-DN110 battery or BM-DN100 battery mount.

You will also need a System Information Display. It is not clear why exactly you need one, but I've asked Shimano and they have confirmed that a display is required for synchro shift on mountain bikes.

Pairing the SC-M9051 - when the 'C' doesn't show

If you've been trying to pair one of these displays to a mobile phone you may have run into the issue of the 'C' (connection mode) not showing. Some of these units do this, depending on the firmware version. This generally isn't a problem, because they do actually go into connection mode. They just don't show it.

I have written more on this in the SC-M9051 Installation guide.

Details & Specifications

Model number:
30 g
E-Tube ports:
E-Tube Port type:
Junction A
XTR M9050 (MTB)

Shopping links

Are you looking to upgrade your bike using this component or tool? I've added links to this component's shopping pages. If you make any purchase using the links below you'll support the site - at no cost to you.