After the initial series’ end, TLC announced the American Chopper: Senior vs. Junior spinoff, which later flipped back to Discovery and ran for four seasons.
Tensions between Paul Sr and Paul Jr led to the latter’s firing in 2008, which caused some obvious complications that eventually led to Paul Jr. opening his own company, Paul Jr. Designs.
Another iteration of the series, Orange County Choppers, ran for a single season on CMT in 2013-2014.
One of Discovery’s most popular shows, as well as one that helped to usher in the unscripted cable boom, American Chopper made its debut in 2002 as a TV special, and went on to air for four seasons before shifting over to TLC for the next two seasons.