A bicycle, also known as a bike, pedal bike or cycle is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other. Bicycles were introduced in the 19th century and now number about one billion worldwide, twice as many as automobiles. They are one of the most popular forms of transportation, particularly in crowded cities and places where cars are either impractical or unable to be used. They also provide a popular form of recreation, and have been adapted for such uses as children's toys, adult fitness, military and police applications, courier services and bicycle racing. Although there are a few standard types of bikes, such as mountain bicycles, racing bicycles, and BMX bicycles, designers are always looking to create new concepts to improve the bicycle. From the slight improvement to drastic redesigns, following bicycles photos are absolutely Innovative and Creative .
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