Ten years after the demise of their rocky partnership, custom motorcycle builders Paul Sr. and his son Paul Jr., are forging ahead with their own shops and separate lives. Senior struggles to meet a deadline, while Junior finds a chance to rebuild a bike.

The OCC crew builds one of their fastest bikes ever but a problem with the supercharger threatens the schedule. Junior races to complete a complicated bike for a client. Father and son find it hard to let go of the past while restoring a bike together.

Senior confronts Junior about the harsh words Junior wrote in his book. Senior closes a game-changing deal with an exotic car dealership to sell OCC bikes directly to the public and Junior's simple mistake leads to destruction in the shop.

The OCC crew is pushed to their limit when they build a pair of contrasting bikes for a client. Junior designs an ethanol-fueled motorcycle and struggles with during assembly. Junior makes a change to the Yankees bike design, and Senior confronts him.

OCC builds a bike inspired by a 1965 GTO, but this massive job may cause Senior to miss the first deadline of his career. When Junior designs a bike for a corporate client, changes in fabrication throw a wrench in the schedule.

When the OCC crew builds an old-school chopper for a longtime fan, Senior must rely on Mikey to get the job done. Junior designs an awe-inspiring trike for a repeat client, and father and son come into the home stretch on the Yankee build.

Senior takes a risk by starting a Spartan Race-inspired build before meeting the client, then has to change course to accommodate his requests. Junior designs a monster trike, but trouble with fabrication of the wheels may mean missing the unveil.

Junior designs a western-inspired motorcycle for country music artist Clay Walker; Senior and the OCC guys build a military-themed bike to be auctioned off to benefit families of fallen soldiers; Senior and Junior assemble the Yankees bike.