sentences:  In 1980, Fox rider Mark Barnett won the company's first National Championship, and two years later, Brad Lackey won Fox 's (and the United States') first Motocross World Championship.In the ensuing two-plus decades, Fox-sponsored riders have won over forty National Motocross and Super cross Championships.In 2006 Fox rider Ricky Carmichael won the AMA Supercross Championship, while longtime Fox rider James Stewart won the FIM World Supercross Championship.