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Dedicated road bicycles have drop handlebars and multiple gears, although there are single and fixed gear varieties. Road bikes also use narrow, high-pressure tires to decrease rolling resistance, and tend to be somewhat lighter than other types of bicycle. The light weight and aerodynamics of a road bike allows this type of bicycle to be the most efficient self-powered means of transportation a person can use to get from one place to another. The drop handlebars are often positioned lower than the saddle in order to put the rider in a more aerodynamic position.