The racing number on Doc Hudson’s blue car in Pixar’s Cars is 51.
Doc’s number is displayed as 51, matching his identity as the Fabulous Hudson Hornet. He raced under that number during his Piston Cup career and won three championships before a crash ended his competitive career.
The design pays tribute to the real Hudson Hornet’s stock-car history. Hudson vehicles were successful in early NASCAR competition, particularly in the early 1950s, when the Hornet’s performance made it a notable racing car.
The number 95 belongs to Lightning McQueen, making it the most likely mix-up. Number 43 is strongly associated with real racer Richard Petty and his Plymouth Superbird, while 86 is not Doc Hudson’s number in the Pixar film.