Drive comes from small motor/gearboxes at each ... This build isn’t fully DIY, as the mecanum wheels appear to be off-the-shelf items, but the rest of the project makes up for this.

British YouTuber James Bruton has created what might be the world’s first driveable, self-balancing, omnidirectional, mecanum-wheeled electrical bike. Made from a mix of off-the-shelf and 3D ...

The real interesting bit is the 3D printed omnidirectional Mecanum wheels he’s designed to fit the motors, which he thinks could have far reaching applications beyond his own project.