Today it is the largest sanctioning body in the world (a position it won as early as 1979 when it surpassed the NBL and the old NBA in numbers) with an estimated 60,000 members and 272 affiliated tracks in the United States, Mexico, and Canada. It is technically an international organization, but does not bill itself as one, based on its mandate to grow BMX in the United States, unlike its predecessor, the International Bicycle Motocross Association (IBMX), and its chief early rival, the NBA, both of which had international aspirations.