👉 A quadricycler is a type of bicycle wheel designed for use on flat terrain. It has two main types, the regular and the cyclo-cross version. The regular quadricycler has a diameter of 27 inches and can handle up to 40 mph on roads with moderate inclines. On the other hand, the cyclo-cross quadricycler has a diameter of 31 inches and is designed for faster speeds on flat terrain.