Motocross (Motorcycle Cross Country), a sport of motorcycle racing held outdoors in rugged natural terrain, was grown in Europe 1960. Then in the later half of the decade, the sport was introduced in the United States as a off-road motor sport as well for leisure. Bringing this outdoor sport of Motocross into baseball stadium, introduced a new sport of indoor Motocross, which is called stadium cross race.
This stadium cross the retains showing unmeasurable growth each year world wide and they commonly call a Supercross race.
As for supercross racing machine requires high riding technique, which is constituted by durable and high performance racing machines.
The engine which is constituted by 2-stroke single cylinder, must be in balance with high power and quick precise response.
The suspension system is also a major importance for supercross racing. Landing stability for large jumps, and handling stability for the washboard portions is essential.