The Wheel Treads are various types of treads for Dr. Tezla's racing teams' cars.
Dr. Tezla reverse engineered them when studying the Racing Drone's tires. After Monkey took a look at a Racing Drone's tire during the Lava Realm, he took it back to the Acceledrome to figure out how the Racing Drone's tires were able to handle the uncontrollable conditions in the Realms. Dr. Tezla then fitted them to both the Teku and Metal Maniac's cars in Speed of Silence, the second movie.
The Wheel Treads were originally created by the Racing Drones, but then used by all of the racing teams by Breaking Point, the third movie. The Wheel Treads consist of various types of treads and are made for specific forms of terrain, such as spikes under the surface for ice, slick treads for better speed, off road tires for rough terrain, and water treads for passing through water smoother. The Wheel Treads change when the user presses a button or flips a switch.