With this website, I will attempt to create a database of all American Supercross and Motocross results since the early 1970s.  Supercross unofficially began in 1972.  Motocross dates back a little further.

Finding complete results prior to 2003 will probably be a challenge, but I should be able to find at least the top 5 overall finishers for all races before then.

If there is demand, and a supply of data for other high level racing series in the United States (Arenacross?) or internationally, I would be open to adding that to the site, but that will not be a focus early on.