Motorcycles and Choppers

The Motorcycles and Choppers Channel explores how these machines are built and customized. Learn all about motorcycles and choppers at HowStuffWorks.

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American Chopper: Metal Fabrication

The OCC team works on fabrication of the Trump bike.

American Chopper: Christian Subs for Senior

With Senior out filming the Celebrity Apprentice, it's up to Christian to take the super-long, super-heavy and super-awesome Grainger bike out for its maiden voyage on a beautiful fall day.

American Chopper: OCC Grainger Bike Aftershow

Mike, Jason, Rick and Senior discuss their love of tools, reflect on the X-rated cake sent by Jesse James, and reveal their plans for the trip to Vegas for Chopper Live.

American Chopper: Jesse James Build-Off Aftershow 2

Jesse James discusses his build-off bike (which he hopes will "translate on a show like American Chopper"), his return to Discovery Channel, and his thoughts on who will win.

American Chopper: And the Winner Is ...

Relive those last few minutes of American Chopper Live: The Build-Off, when Jesse James and the Teutuls awaited YOUR verdict, and the winner -- Paul Teutul Jr. -- was announced.

American Chopper: An Emotional Embrace

A frank conversation with Junior and Senior about their troubled relationship ends --- surprisingly -- in an "I love you" and a hug, sending the Chopper Live crowd to its feet.

American Chopper: The Hanging Bike

Senior's perfect poker face is a thing to behold as Rick Petko returns from lunch to find the bike he's working on with Junior dangling from the ceiling.

American Chopper: Operation Karl Ka-Boom!

Wanting to "freak Senior out," the OCC crew pulls a prank that makes the man flinch in a way we've never seen before.

American Chopper: Senior Gets Fired Up

You know, as the Teutuls will attest -- and demonstrate -- you can pull off a REALLY good prank with the "shock pen."

American Chopper: Spitballs From Nowhere

See what prolonged havoc Vinnie wrought on Paulie with nothing but a clean sheet of paper, a straw, a window made with one-way glass and a whoooole lotta spit.

American Chopper: Built to be Punished

One difference between his bikes and OCC's, according to Jesse? They not only look good, they function.

American Chopper: Hurtful Words

Mikey and Junior watch on in disbelief when, in an episode of the Chopper Aftershow, Senior refers to Jesse James as a "genius" and predicts Jesse will win the three-way build-off.

American Chopper: Killer Design

The arrival of a custom chassis begins to give some shape to OCC's "evil, crazy, I'm-going-to-kill-your-town" build-off bike design.

American Chopper: PJD 9/11 Memorial Bike Aftershow 1

From the honor of being commissioned to the choice of aluminum over steel, Paul and Vinnie take you behind the scenes of the very emotional 9/11 Memorial build.

American Chopper: PJD WTC Bike Ep 2 Part 1

Paul and the gang respond to questions about the World Trade Center bike, including whether or not they were surprised when the Mayor of New York City sat on the bike at the reveal.

American Chopper: PJD WTC Bike Ep 2 Part 2

In the World Trade Center bike Aftershow, Paul and the crew talk about their favorite part of the bike and music.

American Chopper: A Bike To Remember

New York mayor Bloomberg accepts PJDs 9/11 memorial bike.

American Chopper: Cake Surprise

Senior gets a gift from Jesse James that he is not to happy with.

American Chopper: Penal Cake Decoded

After an exhaustive investigation, Mikey solves the mystery of who sent Paul Jr. Designs an X-rated cake (note to Jesse James: some lobster next time would be muh appreciated).

American Chopper: Jesse James Returns

Jesse James explains the three-way build-off between him, Paul Teutul Jr. and Paul Teutul Sr. ... as only Jesse James can.

American Chopper: Off the Hot Seat

Jim Quinn and Mike Ammirati engineer a workaround so the Grainger Bike's exhaust isn't so close to the seat (which would make it HOT), while staying true to Jason's design.

American Chopper: Facebook Faux Pas

A slip of the mouse leads to an awkward social-media situation between Vinnie and Steve Moreau.

American Chopper: Mikey Busts

Vinnie's shooting of a rabid raccoon brings about a lot of teasing.

American Chopper: Giddyup Gas Tank

As fabrication on the impressive Arabian Horse Bike continues, truer words -- "That is one big horse gas tank" -- have never been spoken.

American Chopper: Project Free Rick

With everyone at Paul Jr. Designs missing their former colleague Rick Petko, Mikey reveals his master plan to help liberate their old friend from OCC.