One day, Tiny Tractor sees a fire truck zooming to a fire and decides he wants to drive fast, too. But tractors aren't made to go fast, and when he tries, one of his wheels falls off. Instead of getting it repaired, Tiny Tractor decides to go to the tire shop to get a brand-new wheel. First, he tries a dump truck wheel, but it's too big and makes him tip over. Then he tries a train wheel, but it's so heavy that he can't move! Finally, he tries a bike tire, but that one won't turn in the right direction. Could it be that the right wheel for Tiny Tractor is the one that's made especially for him?