Two brothers overcome emotional and physical obstacles to achieve success in the competitive world of Supercross racing. The brothers' conflicts are magnified by their different life choices and their decision to become competitors and rivals. KC Carlyle is a more cautious rider than his younger brother Trip, who has more natural talent but takes too many risks. When KC gets an all-expenses paid "factory" -- corporate sponsored -- ride, a rift forms between the two brothers. Trip is forced to go at it alone, becoming a "privateer"--a rider without a sponsor. But when a career threatening crash ends Trip's Supercross career, he and KC realize that they must put aside their conflicts, and work together to help KC defeat the world's greatest Supercross champions.