The evolution of off-road motorcycles, commonly called dirt bikes, is a long and complicated story. The first motorcycles were actually nothing more than modified bicycles with attached gasoline engines. These powered bicycles were amazing inventions in their day. Unreliable, but amazing methods of transportation, these motorcycles began captivating people across the globe. Since paved streets were not quite the norm at the time, motorcycles generally could be considered dirt bikes right from the start. No single person or company has been credited with the invention of the dirt bike. Off-road motorcycling is really an evolution of many years, with better tires, better suspension and seats, stronger frames, and better control features being credited to many individuals who were essentially modifying their own bikes for better off-road use. Triumph motorcycles did however design a motorcycle specifically built for dirt riding in 1914, although this model is not actually credited with being the first dirt bike.