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MX1 is for 250 cc to 450 cc (fourstroke) and MX2 for 175 cc to 250 cc fourstroke motorcycles.
Freestyle Motocross (FMX), a relatively new variation of supercross, started out by the South African champion, Marco Urzi, does not involve racing and instead it concentrates on performing acrobatic stunts while jumping motocross bikes. The riders are scored on style, level of trick difficulty, best use of the course, and, frequently, crowd reactions.
FMX was introduced to the X Games and mainstream audiences in 1999.
The typical two-stroke air-cooled, twin-shock rear suspension machines gave way to machines that were water-cooled and fitted with single-shock absorber rear suspension.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.The bikes have special road-racing tires with grooved tread to grip both the pavement and dirt.Some tracks for these race events have jumps, berms, and whoops like motocross tracks.