The weird black gear on the roof actually connects to the front wheels, allowing them to turn left and right. Sadly, Lego seems to have used a generic set of wheels instead of something more ...

For many people, Lego is their first entry into the world of engineering. With the Technic line of building blocks complete with all manner of gears and shafts and wheels, there’s a ton of fun ...

Mechanum wheels are great, but you have to have them perfectly alined or they come across a little clunky, giving your robot a herky-jerky movement. Robotics educator and supreme LEGO builder ...