they have separate classes but theyre like, stree compact, sport compact, high school level and others that i can remember just look through the site and im sure u can get a better idea. it all depends on cars and how fast your it is. i would assume that most of us would fall under the street compact. its 10 dollars to watch, but its fun to race. lol, there was this mini mo-ped type bike that ran a 22.5s@55mph....yea baby