How to connect your Di2 system to your Windows computer

Modern Di2 is basically a couple of controllers and servo motors that communicate with each other using the EW-SD50 wires. Shimano lets end-users configure their own Di2 systems using their e-tube project software. This page explains how to connect your bike to your computer.


Connecting a Di2 bike to a Windows computer is done via the charging / interface port on the Junction A. Note that if your bike uses the older SM-EW67A junction then you will not be able to connect your bike using the charger.

In that case you need the SM-SM-PCE1/SM-PCE02 diagnostics device.

You probably know where the charging port is - but just in case you don't, have a look at this image:

Di2 charge and interface port

Make sure you have either the SM-PCE1/SM-PCE02 diagnostics device or the SM-BCR2 charger. Also, download an up to date version of the e-Tube Project software.

e-tube presets e-tube start

Connect using e-Tube Project

Plug your charger into the junction box and connect the other end to your computer – the order doesn’t really matter, but I tend to plug the connector into the bike first. Start the e-Tube Project software. Select your bike type (road, MTB, Urban/City, STEPS e-bike or ‘other e-bike’) system. Your bike type is determined by the derailleurs installed on the bike.

e-tube presets connection check

Click ‘Connection check‘. The software will tell you to connect your SM-PCE1/02 or SM-BCR2. If you’ve already connected one of those this little popup will disappear after a few seconds.

It’ll then tell you that charging has stopped because you’ve connected the bike to the computer and started the software.

If you’re using a road bike it will also ask you whether you’ve connected satellite shifters to your main shifters. Answer the questions and it’ll complete the connection.

e-tube presets e-tube home This is what you’ll see once a connection has been made.