There are 8 different types of dirt bikes ;and while they share the same general idea, they all have different specialties when it comes to what kind of riding you are about to do. Motocross Motocross dirtbikes are considered high performance due to their bigger engine size and modification to the frame because of the jumps and corners, which can be hard on other types of dirt bikes. A motocross engine can vary from 125cc to 450cc. http://www.lianmeivehicle.com/