Design and Analysis of 2 - Speed gearbox for Bicycles

ABSTRACT This paper sees the implementation of the transmission system of a common road vehicle to a bicycle. The design and analysis have been performed on a normal bicycle with standard dimensions. The gears used for the design are also standardized from those available in the market. The end results that we achieved is reduced effort by 57% for the rider, increase in speed at low pedalling rpm to around 138% and higher Torque by 133%. The transmission will be a small gear box attached to the pedalling shaft which will transmit power to the output shaft connected to the sprocket via a normal chain. A Factor of Safety of 5.68 has been obtained on analysis of design, thereby rendering our design safe for use.