System Information Display - Junction A

SC-MT800 - System Information Display - Junction A image

The SC-MT800 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 Di2 components to it. The displays lets you charge the system and also connect to it using Bluetooth and ANT+. It is usually installed on mountain bikes.

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! Note that you can only have one component with wireless/bluetooth functionality plugged in. If you connect both this and a Wireless Unit the Di2 system won't function.

Current generation battery or mount required

Just like the SC-M9051 display, this SC-MT800 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.

XTR display vs XT display

In case you are wondering what the difference is between these two displays - there is none. The casing is different, but the functionality is exactly the same.

Pairing the SC-MT800 - when the 'C' doesn't show

If you've been trying to pair one of these 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-MT800 Installation guide.

Details & Specifications

Model number:
30 g
E-Tube ports:
E-Tube Port type:
Junction A
XT M8050 (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.

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