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Rulings differ from country to country but supercross is a sport that needs either qualifications and/or a license. Some countries the rider must be at least an A class rider in motocross and then attend a course to prove they are capable of supercross and if they can do so they have their National license endorsed for Supercross. In other countries the rider must rack up points to enable them to turn pro rider winning many major events along the way and once they have this they can then race supercross. So the easiest way to get the right information is to contact the governing body of motorsport in your own country or go onto their web site and look at their rule book
supercross
As long as they're not on the bike with you.
Yamaha Supercross happened in 2008.
Supercross was released on 08/17/2005.
The Production Budget for Supercross was $30,000,000.
Yamaha Supercross was created on 2008-11-25.
Supercross grossed $3,252,550 worldwide.
Supercross grossed $3,102,550 in the domestic market.
Supercross
Jeremy McGrath Supercross World happened in 2001.
What did Feld pay Live Nation to acquire Supercross