James Stewart Jr. (born December 21, 1985) is an American former professional motocross and supercross racer, widely regarded as one of the most talented and dynamic riders in the history of the sport.

[2] Nicknamed "Bubba," Stewart revolutionized motocross with his aggressive riding style and groundbreaking "scrub" technique, which allowed him to clear jumps faster and with more precision than his competitors.

"[4] Stewart's influence extended beyond the track, becoming the first African American rider to dominate motocross and supercross at the highest levels.

[5] He also starred in his own reality television series, Bubba’s World, which showcased his life and career, along with several video games such as James Stewart’s Motocross.

[6][7] James Stewart Jr. was born on December 21, 1985, in Bartow, Florida,[8] and began racing motocross under the guidance of his father at the age of four.

[9] Stewart turned professional in 2002,[10] joining Kawasaki and competing in the 125cc class of the AMA Western Regional Supercross Championship.

The transitional year brought Stewart his first Supercross premier class win in Texas in round 12, but also inconsistency due to crashes and injuries.

Later that year, he represented Team USA at the Motocross des Nations in Matterley Basin, England, alongside Ryan Villopoto and Ivan Tedesco.

After recruiting Aldon Baker[11] to help him heal from the injury, he would go on to win all 24 motos in the 450cc class, joining Ricky Carmichael as the only riders to complete such a feat.

Upon his return, Stewart competed sporadically but was unable to recapture his previous dominance due to ongoing injuries and the increasingly competitive field.

[25] He suffered a deep bruise to his bone and muscle in his left shoulder during seeding trials for SuperMoto on July 31, forcing him to drop out of the games.

On March 28th, 2011, Stewart was arrested for impersonating a police officer, after attempting to stop another vehicle containing two off-duty highway-patrol troopers using red and blue police-style flashing lights.