In Pixar's Cars 3, what racing series does Jackson Storm dominate at the start?

In Pixar's Cars 3, Jackson Storm dominates the Piston Cup Racing Series at the start of the film.

Storm is part of a new generation of high-tech racers whose speed and advanced training methods challenge the older competitors. Lightning McQueen struggles to keep pace, and a crash during a race makes him question whether he can continue competing at the highest level.

The Piston Cup is the fictional stock-car championship used throughout the Cars films. In Cars 3, the series changes as modern racers replace established stars. Lightning eventually trains with Cruz Ramirez and learns that preparation, adaptability, and mentorship matter as much as raw speed.

The Piston Cup should not be confused with the World Grand Prix in Cars 2. The World Grand Prix is an international racing event, whereas the Piston Cup is the domestic championship that forms the main competitive setting in Cars and Cars 3.