OCC shucks some corn and plows into their next project, the world's first renewable fuel chopper for the Iowa Farm Bureau. The Teutuls check in on OCC's new world HQ, and NASCAR champ Tony Stewart stops by to check on his bike.

Episode Viewers and Ratings

Season 4 Episode 21 of American Chopper resulted in a 0.00 rating in the 18-49 demographic.

American Chopper Season 4 Episodes...

• s04e01 - Junior Vs. Senior Part 1
• s04e02 - Junior Vs. Senior - Part 2
• s04e03 - Go Daddy Part 1
• s04e04 - Go Daddy 2
• s04e06 - Flowjet Bike 1
• s04e07 - Flowjet Bike 2
• s04e08 - HP Bike 1
• s04e09 - HP Bike 2
• s04e10 - Peavey Bike 1
• s04e11 - Peavey Bike 2
• s04e12 - Australia 1
• s04e13 - Australia 2
• s04e14 - Australia 3
• s04e15 - Intel 1
• s04e16 - Intel 2
• s04e17 - Byron Nelson 1
• s04e18 - Byron Nelson 2
• s04e19 - Silver State Choppers' Chopper 1
• s04e20 - Silver State Choppers' Chopper 2
• s04e21 - Iowa Farm Bureau Bike 1
• s04e22 - Iowa Farm Bureau Bike 2

American Chopper Show Summary

American Chopper profiles the lives of New York natives Paul Teutul Sr. and son Paul Jr. of Orange County Choppers (OCC), creators of the world's most outrageous custom motorcycles. Follow the day-to-day drama of this volatile father and son team as they battle impossible deadlines - and each other - to push the envelope of motorcycle design and fabrication.