I pressed the button on the junction box, but bluetooth won't connect

The road junction A (SM-EW90 / EW-RS910) manual mention that you can press-and-hold the button on the junction box to enable bluetooth connection mode… and it is not wrong.


It just isn’t completely right either.

What the manual fails to clearly mention is that you also need a Wireless Unit or D-fly, or a System Information Display. Without either of those you will not be able to connect to the bike using your mobile phone or tablet, no matter how hard you try.

Now, the mountain bike junction A SC-MT800 and SC-M9051 are supposed to display a 'C' when they are in connection mode. Unfortuately they don't always. The recommended way to connect them to your mobile app is as follows:

  • Start the E-Tube app
  • Enable Bluetooth on your phone
  • Tap the 'connect' button in the mobile app
  • Now hold the button junction button for 0.5 second and release
  • The SC-MT800 / SC-M9051 will now appear on your phone. Tap it to connect.