What Is a Motorcycle?

A motorcycle is a two-wheeled motor vehicle steered by a handlebar from a saddle-style seat. Motorcycle designs vary widely to suit a wide variety of purposes: long-distance travel, commuting, cruising, sport (including racing), and off-road riding. The term motorcycle is also used to refer to the motorcycle culture and lifestyle, which includes social activities such as riding clubs and rallies. A motorcycle may also be equipped with a trailer in order to haul additional gear.

The power-to-weight ratio of a motorcycle is very high, with a much quicker rate of acceleration than a car. This high kinetic energy can result in dangerous situations if the rider is not prepared or experienced enough to handle it, and so some countries regulate the size of engine that can be ridden on public roads.

Typical motorcycles have a low mass compared to their passengers and other motor vehicles, and so benefit from excellent fuel economy. However, poor aerodynamics of exposed riders and engines designed for goals other than fuel economy can offset these benefits.

Many motorcyclists have a strong interest in the mechanical aspects of their bikes, and some are involved in customizing or tuning their rides. This is often done with aftermarket parts, such as performance exhausts and intakes. Some customizations are based on aesthetics, such as paint color and frame shape. Other customizations are based on functionality, such as the addition of a trunk to carry luggage, or the use of clip-on handlebars for a more forward riding position.