 Professional ATV classes consist of the premier "XC1 Pro ATV" class and the "XC2 Pro-Am ATV" class to serve as a stepping stone for riders moving out of the amateur classes.Professional motorcycle classes consist of the "XC1 Open Pro" class for any size motorcycle, the "XC2 250 Pro" class for 250cc motorcycles and the "XC2 125 Pro-Am" class reserved exclusively for 125cc 2-stroke motorcycles.Over the years the series has been contested by thousands of different riders across the world.