I’ve seen cars with the wheels attached so tightly to the car body that the wheels barely turn. Needless to say, these cars don’t do very well in the race competition. I’ve also seen cars with the wheels so loose that they “wobble” all over the race track -- also slowing them down. Well, somewhere between “too tight” and “too loose” there has to be a “just right” and that’s what we determine -- experimentally -- in this section.