The National Bicycle Association (NBA), later known as the National Bicycle Motocross Association (NbmxA), was a United States-based Bicycle Motocross (BMX) sports sanctioning body originally based in Soledad, California that was created by Ernie Alexander in 1973 and ceased operations as an independent body in 1981. It was the first and for its first few years until 1980 the largest sanctioning body in the United States concerning BMX. It was known for its pioneering works in founding the organized sport of BMX. It was both the first true sanctioning body and the first nation-spanning one (as opposed to the regional ones that emerged), although at first it was concentrated in the west coast of the United States, where it was founded. It was the first body to hold true nationals in which racers coming from all over the country competed for points and in the case of professionals, money, to determine who would earn the right to run a National no. "1" plate in the several divisions and age classes the following year. It was the first sanctioning body to have a professional division, which was created as far back as late September 1974.
Mr. Alexander was a former raecer that promoted races at the famous Indian Dunes, built and managed by Walt James, where many movies and TV shows were filmed. On one occasion in 1970, he noticed a group of kids trying to organize a bicycle race with their Schwinn Sting-Rays and Sting-Ray like bikes. Being the motorcycle promoter he was he lent the kids a hand. At that moment the path to the NBA was set. Mr. Alexander opened the Yarnell track, a steep downhill course that was by our insurance concerned standards very steep, fast and hair raising. Speeds of 40-45 mph were not unheard of. It had more in common with today's Mountain Biking courses than a modern well groomed and safer (some say too safe) BMX tracks. The popularity of his races grew until it became practically a full-time job. In 1973 he decided to formalize it and create the National Bicycle Association modeled on the existing American Motorcycle Association (AMA) for motorcycle Motocross (MX). It rapidly grew in number of tracks and members spreading from Southern California. Tracks were eventually established as far as the East coast. The NBA became the first national governing body for BMX.
The famous Yamaha Bicycle Gold Cup events in 1974 could be said was a quasi national in which it was a race series that was held sequentially at four different California tracks culminating in the series finale in Anaheim, California on September 14, 1974. However, the first true national occurred on March 30, 1975 in Phoenix, Arizona. This was the major first race held outside of California and in which national points were given both to those who raced outside and within of the state of California. The national would be held in the sanctioning body's one non-Californian track in Phoenix, Arizona (the Kartland Track located at 3610 West Indian School Road) and its members could race in a sanctioned event based in Arizona if they wished to come. This was in addition to many other first including the first BMX National number one Amateur racing title holder which was David Clinton. In 1976 the NBA created the first formal pro class and had its first No.1 pro, a twenty-year-old Scot Breithaupt. However, the first mention of a professional class by the NBA was in the October 1974 issue of Bicycle Motocross News at the Valley Youth Center track in Van Nuys, California: