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. Motorcycle Motorcycles are descended from the “safety bicycle,” a bicycle with front and rear wheels of the same size and a pedal crank mechanism to drive the rear wheel. There are many systems for classifying types of motorcycles, describing how the motorcycles are put to use, or the designer’s intent, or some combination of the two. Six main categories are widely recognized: cruiser, sport, touring, standard, dual-purpose bike. Some motorcycles are specially adapted for specific job functions, such as those used by the ambulance, Blood Bikes, fire, and military services, and for specilized delivery services, such as pizza deliveries. Beginning in the 1960s with the Mountain Goat specialised motorcycles were developed for use on farms. While motorcycles typically have two wheels, some motorized tricycles are classed as three-wheeled motorcycles. Some brands have made various types of three-wheelers direct from the factory. Most of these vehicles are treated as motorcycles for registration or licensing purposes.