There are a large number of manufacturers who deal with motocross bikes. The status and country bring out their difference. They supply both racetracks-only or off road-only as well as street owners with motorcycles. These manufacturers are found all over the world and manufacture the motorcycles according to demands of the sport.
These motocross bikes started existing as early as 1900. The intense competition involved in this sport puts manufacturers on toes. Modifications can be done every other time depending on the terrain. For example, rigid frames by early 1930s changed to suspensions. Then by 1950s the suspension became different.
Companies such as CZ from onetime Czechoslovakia, Greeves from England and Husqvarna from Sweden became popular due to agility and lightness. These companies dealt with the two-stroke motorcycles only.
In the 1970s and 1980s, the Japanese manufacturers evolved the two-stroke air-cooled, twin-shock rear suspension machines to water-cooled, fitted with single shock absorber rear suspension.
Manufacturers in California because of strict environmental laws developed environmentally friendly four-stroke motorcycles. After a while all the major manufacturers borrowed the idea. They use those motorcycles for races.
These motocross bikes should be handled with care because apart from fun it can also cause fatalities.