When KC gets a factory ride or a corporate sponsor with Japanese racing team, a rift forms between the two brothers and Trip is forced to go alone as a privateer. Unfortunately KC finds that having a corporate sponsor isn't as great as he expects, when he gets the disappointing news that he is not the one who is suppose to win. He is simply to clear the way for the sponsor's son to come in first across the finish line. Trip, on the other hand, competes on a bike that is provided by a man whose beautiful daughter (Cameron Richardson) knows just about everything there is to know about motorcycle engines.
Though there are some moments of romance and sibling rivalry, Supercross is basically what it suggests that it is about. Motorcycles, motorcycle racing and more motorcycles.