The AMA racing classes are developed by the AMA Congress to match a rider's age to the engine size of a motorcycle. Youth courses are classified according on age and machine CC. Adult divisions (125cc and above) are divided into two categories: machine CC and age, or rider classification/experience. The latter is measured in years where 1 year equals 365 days. There are three youth classes: Novice, Amateur and Expert. There are also three adult classes: Master, Grand Prix and Open. In addition, there is a combined adult-youth class called Masters Cup. A rider can choose which class he or she would like to compete in. If no one from your team wants to race in a particular class, you can have a spare bike parked outside the garage with the kickstand raised high enough so that only the front wheel is off the ground. This way, if someone needs a test ride, they can take it for a spin without being disqualified for unsportsmanlike conduct. The most important thing when choosing a class is knowing what type of riding you will be doing. If you plan to mainly follow other bikes during races, then go for a faster class. If you're more of a soloist who doesn't mind getting close to the barriers every now and then, choose a slower class. Either way, you'll have a better time if you know what you're in for beforehand.