Part 3: Read the History of BMX Biking, then decide if each sentence is true or false. unectr OREME3EH 1118 How it started BMX biking began in the late 1960s in southern California. It's based on the sport of motocross, which dates back to 1924 and involves racing motorbikes across rough tracks. It started when children began to copy motocross riders by racing their bikes on tracks which they built themselves This new form of bike racing was named bicycle motocross, or BMX.