Motocross

Motocross first evolved in the United Kingdom from motorcycle trials competitions, such as the Auto-Cycle Clubs's first quarterly trial in 1906 and the Scottish Six Days Trial that began in 1909.[1][2] When delicate balancing and strict scoring of trials were dispensed with in favour of a race to be the fastest rider to the finish, it was called scrambles, said to have originated in the phrase, "a rare old scramble" describing one such early race.[1] Originally known as scrambles racing in the United Kingdom, as the sport grew in popularity, the competitions became known internationally as motocross racing, by combining the French word for motorcycle, motocyclette, or moto for short, into a portmanteau with "cross country".[1] The first known scramble race took place at Camberley, Surrey in 1924.[3] During the 1930s, the sport grew in popularity, especially in Britain where teams from the Birmingham Small Arms Company (BSA), Norton, Matchless, Rudge, and AJS competed in the events. Off-road bikes from that era differed little from those used on the street. The intense competition over rugged terrain led to technical improvements in motorcycles. Rigid frames gave way to suspensions by the early 1930s, and swinging fork rear suspension appeared by the early 1950s, several years before it was incorporated on the majority of production street bikes.[4] The period after World War II was dominated by BSA which had become the largest motorcycle company in the world.[4] BSA riders dominated international competitions throughout the 1940s.[4]

A Maico 360 cc with air-cooled engine and twin shock absorbers on the rear suspension

In 1952, the FIM, motorcycling's international governing body, created an individual European Championship using a 500 cc engine displacement formula.[4] In 1957 it was upgraded it to World Championship status.[4] In 1962, a 250 cc world championship was created.[4] It was in the smaller 250 cc category that companies with two-stroke motorcycles came into their own. Companies such as Husqvarna from Sweden, CZ from the former Czechoslovakia and Greeves from England, became popular due to their lightness and agility.[4] By the 1960s, advancements in two-stroke engine technology meant that the heavier, four-stroke machines were relegated to niche competitions.[4] Riders from Belgium and Sweden began to dominate the sport during this period.[2] Motocross was introduced to the United States in 1966 when Swedish champion, Torsten Hallman rode an exhibition event against the top American TT riders at the Corriganville Movie Ranch also known as Hopetown in Simi Valley, California. The following year Hallman was joined by other motocross stars including Roger DeCoster, Joël Robert, and Dave Bickers. They dominated the event placing their lightweight two-strokes into the top six finishing positions.[5][6] Motocross began to grow in popularity in the United

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