Bike, push bike or bicycle is a human powered and pedal driven vehicle. It has two wheels, one behind the other. Person riding the bicycle is called the cyclist. They were introduced somewhere in the 19^th century and were one of the primary mode of transportation in the early times. But still the number of bicycles is more than the number of automobiles.

This machine is over the top in both mechanical and biological ways. In the biological point of view it doesn’t cause any pollution which is the main problem of all the automobiles. In mechanical terms, 99 percent of the energy of the rider is transmitted to the pedals. Bicycle commuting mainly reduces the risk of human life, offers a health body due to calories burnt while pedaling and last but not the least is economically very cheap. But yes as there are limitations to everything there are some offsets to this machine too and they are the security risk, limitation to travel long distance and increased travel time.

They are a very good mode of entertainment for the kids and they also serve the fitness purpose. Other than these they are used for mountain biking, bicycle touring, racing, courier service, mail delivery etc.

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