The 203mm Aluminium Mecanum wheels Basic (Bush type rollers) is a heavy duty wheel. The 203mm Mecanum wheel set (1x left, 1x right). You can also use universal hubs to connect the wheels and motor. Using rollers on 45° rotational axis of the main wheel. As the wheels rotate in sync, the vehicle moves forwards or backward normally, but by spinning pairs of wheels in opposite directions, the rollers enable sideways movement.