theres about 10 classes, youth, utility, C, C+30, B, B+30, A, A +30, Pro Am, and Pro, if you guys have ever been to a harescramble race other wise known as cross country racing, then theres many classes based on experience, but they are all racing at one time on a 6-10 mile track through woods, so sometimes it gets as tight as 50 inches through there and barely opens up, go to you tube type in OXC and watch the holeshot videos i've made on the Missouri XC series called OXC, it will show all the classes go through, im racing C class basicly meaning beginner so i'm racing whatever the other C class racers have which can be anything but the experience is the same so its whoever can throw the bike around better if any of this makes sense, i can never type what im trying to say lol sorry