BMX began in the early 1970s, when children started cycling on dirt roads in Southern California, inspired by the popular sport of motocross at the time. One of the bikes available at the time, the Schwinn Sting-Ray became the choice, because it had a motocross-like frame shape, 20-inch tires, high handlebars, long seats, and was easy to modify for good control and performance on dirt roads. . This bicycle phenomenon has become very widespread since its appearance in the film "On Any Sunday" in the United States, a documentary about motocross in 1971. In the opening scene, it shows children riding Schwinn Stingrays bicycles on off-road roads, which inspires BMX sports and racing. By the middle of the decade, the sport of BMX had a lot of interest, and factories began to produce bicycles specifically designed for this sport.