Bicycles have been a part of people since a long time ago. Some people ride them to school and some people use them to exercise. They are also used as children’s toys and in competitive sports, known worldwide but not a lot of people know much information about bikes.
First, the definition of bikes is a pedal driven, human powered vehicle that is attached with two wheels. Bicycles were introduced in the 19th century. The shape of the bike has changed little since 1885. The first picture is an ordinary bike that was photographed in the Skoda museum in the Czech Republic. The second image is a bike called “Wooden Dandy Horse” that was made around 1820. These bicycles are unusual bikes that you will normally not be able to see in the town.
Second, the most common types of bicycles are utility bikes, mountain bikes racing bikes, touring bikes, hybrid bikes, cruiser bikes, BMX bikes. The less common ones are tandems, lowriders, tall bikes, fixed gear, folding models, and recumbents.
Last, the third picture is a bike-sharing station in Barcelona and the fourth picture is a commuting bike in Amsterdam which shows how bikes can be used and how people share for each other.
These were information about bicycles and I hope people would understand the history and ride more bicycles to exercise.For more information: http://en.wikipedia.org/wiki/Bicycles