In Pixar's Cars, which real race is the Piston Cup modeled after?

In Pixar's Cars, the fictional Piston Cup is modeled after NASCAR's Winston Cup Series.

The Piston Cup is the central stock-car racing championship in the first film. Lightning McQueen, Chick Hicks, and The King are tied before a final race determines the season's outcome. The competition's oval-track format, pit stops, sponsorship culture, and stock-car designs closely reflect American NASCAR racing.

The name Winston Cup refers to NASCAR's premier series sponsorship period, which ran from 1971 through 2003. The series became the Nextel Cup in 2004 and later changed names again. Cars does not present the Piston Cup as a real NASCAR trophy; it is a fictional championship created for the animated world.

This distinction matters because the Piston Cup is sometimes loosely described as the Indianapolis 500 or Formula One. Those are different forms of motorsport with different car designs, race formats, and histories. Pixar used NASCAR as its main racing foundation while inventing characters, teams, tracks, and championship details for the story.