A bike, short for "bicycle," is a human-powered vehicle with two wheels that are mounted one behind the other. It typically consists of a frame, handlebars for steering, pedals for propulsion, and a seat for the rider. Bikes are commonly used for transportation, exercise, recreation, and sport. They come in many different types, including road bikes, mountain bikes, hybrid bikes, and BMX bikes, and can be made from a variety of materials such as steel, aluminum, carbon fiber, and titanium.
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