More descriptions: Episodes 1 to 10 | Episodes 11 to 20 | Episodes 21 to 30 | Episodes 31 to 40 | Episodes 41 to 50 | Episodes 51 to 60 | Episodes 61 to 70 | Episodes 71 to 77 |

Episode 51: Gillette Bike 2
The guys complete the bike for Gillette, unveiling it at Boston's Prudential Center. Meanwhile, as an added bonus, Mikey babysits Vinnie's daughter, so Vinnie and his wife can have a much-needed night out.
premiere: April 25, 2005

Episode 52: NAPA Drag Bike 1
It's off to drag-racing school in New Jersey for the OCC guys, as they prepare to build a drag bike for NAPA. And this bike will be unlike any other: It'll have a straight speed of 140 mph, and will be used in actual races on the quarter-mile drag track. Also out of the ordinary is Mike, who stops his loafing around and gets a new title at OCC after Mike Campo quits.
premiere: June 6, 2005

Episode 53: NAPA Drag Bike 2
OCC finishes the NAPA bike, and Vinnie races it down the strip in an actual drag race.
premiere: June 13, 2005

Episode 54: Military Bike 1
Junior and Senior join forces to build bikes that will be auctioned off, among other items, to benefit the families of U.S. troops seriously wounded or killed in Iraq and Afghanistan. To learn more about the two charities benefiting from the auction — the Intrepid Fallen Heroes Fund and the Fisher House Foundation — OCC takes a field trip to the USS Intrepid, the scene of their Jet Bike unveiling so many years ago. Back at the shop, Senior has his mother's Cadillac restored to its original condition, surprising her with it, as father and son work through their rivalry and get started on their bikes.
premiere: Sept. 5, 2005

Episode 55: Military Bike 2
After a trip to the nuclear submarine USS Albuquerque for additional inspiration, Senior finishes his old-school chopper, and Junior, his more modern bike. Then it's off to the Walter Reed Army Medical Center in Washington, D.C., to show the wounded troops their creations. Finally, as the auction draws near, OCC enlists the help of their celebrity friends, including Steven Tyler of Aerosmith, to obtain items to auction off and raise more money.
premiere: Sept. 12, 2005

Episode 56: Yankees Bike 1
At Yankee Stadium, the Teutuls meet with New York Yankees catcher Jorge Posada to discuss building a bike to be auctioned off to benefit his foundation, which endeavors to further awareness of and research on craniosynostosis, a condition that affects the craniums of infants, and provides financial support to families whose children are affected by it. Back in the shop, Senior plays hardball with Junior when he doesn't see enough progress being made on the bike, and when the pressure becomes too much, OCC challenges Orange County Ironworks to a game of softball.
premiere: Sept. 19, 2005

Episode 57: Yankees Bike 2
Hoping for the inspiration they need to finish the bike, the guys head to a New York Yankees game with Grandma. Mikey is put in charge of getting the gas tank signed by the entire Yankees team, and he guards it with his life as he attempts to complete the task. Then, once assembled, the bike is revealed at the auction to benefit the Jorge Posada Foundation.
premiere: Sept. 26, 2005

Episode 58: Space Shuttle Tribute Bike 1
The OCC gets an out-of-this-world experience as they head to the Johnson Space Center in Houston, Texas, to get some inspiration for the NASA-themed bike that they will build. The bike will be a tribute to the space shuttle program and a memorial in honor of the two crews that were lost in space. While there, the guys get a tour of the facility, and go into a shuttle simulator. Once back in the shop, the stars aren't aligned as Junior and Senior argue about Junior's work ethic, and Mikey plays astronaut and launches some rockets of his own.
premiere: Oct. 3, 2005

Episode 59: Space Shuttle Tribute Bike 2
The guys of OCC take off to Cape Canaveral, Fla., to watch the launch of the space shuttle Discovery, seeking more ideas for the NASA-themed bike. Once back in the shop, Junior continues to work on the bike while Senior and Mikey build a model space shuttle together. After the bike is assembled, OCC heads back to the Johnson Space Center in Houston, Texas, to reveal the bike to NASA and the astronauts who returned home on Discovery.
premiere: Oct. 10, 2005

Episode 60: Rick's Bike 1
As Senior and Rick finish a production bike together, Senior decides to surprise Rick and tells him that the next bike that they build will be for him. Mikey comes in to help Rick, and acts as his inspiration. Junior doesn't want to work on the bike, but Senior gets involved and forces him to. When Junior works on the design with Jason Pohl and the computer crashes, Jason freaks out over the lost material. Outside the shop, Vin and Cody head to Vin's house when a bat decides to invade his home.
premiere: Oct. 17, 2005