Abstract: Bicycle is one of the most commonly used form of transportation in the world. It is two wheeled vehicle, powered by a rider and steered using a handle. It is considered as eco-friendlier and an economical mode of transport in the world. Existing form of bicycle is evolved from the developments in its past history. Research is carried on making the bicycle economical and more comfortable. In this review paper, various designs developed in the history of bicycle are described. This review paper summarizes an up-to-date progress in different methods for transmission of human power on the pedal to the rotation of the wheels and the major advantages and disadvantages of these transmission methods. It covers how the energy efficiency of the bicycle is calculated considering the case of a chain driven safety bicycle. It is intended to help readers to obtain a comprehensive review on design developments in bicycle.

Keywords: Bicycle, Economy, Eco-Friendly, Human Power.