Release Date: August 12, 2010
No. of episodes : 30 episode(s)
Latest Episode : Season 4 Episode 16 (11-Dec-2012)
Once partners, they are now fierce competitors at contending motorcycle shops. Senior continues his struggle to keep OCC afloat during difficult financial times, while Junior is now on a mission to expand his fledgling design company and return to his bike-building roots. Who will come out on top as OCC and Paul JR Designs start cranking out competing bikes, side by side, each week on American Chopper Sr. vs Jr.