Dirt bikes are lightweight, off-road motorcycles built with a rugged frame, special tires and stiff suspension to navigate hilly, rough terrain in all types of weather. Dirt bikes are used in motocross racing events held in North America, Europe and Asia. Adverse conditions require these bikes to be specially constructed, with many high-performance components incorporated into street motorcycles, including cruisers and sports bikes.Also dirt bikes are not license to the street.