As the ancestor of "Motorcycle Road Film" and the first film to reflect the illegal motorcycle gangs in the United States, the only person in the film who can compete with Marlon Brando's charm is not beautiful girls, but "the most legendary mechanical invention of our time"-motorcycles. In this film, future generations can review almost all the locomotives that can be seen in the United States at that time: Norton, BSA, Triumph, Harley Davidson, Thunderbird. It was like a family photo of the motorcycle at that time. Brando as the focus of public attention, his mount is also the top choice of locomotives: triumphant 6T, Thunderbird 650, of which Triumph 6T used three. Why didn't Brando choose the famous Harley? There is something else in it. The "biker gang" is based on real people. After a famous US air brigade was disbanded, the unemployed pilot stepped on a military Harley motorcycle and went to the city to revolt: "We used to be heroes, but now no one needs us." Time magazine published a big picture of a drunken young man riding on a Harley.