Power Transmission of bicycle

(a) Driver and driven gears rotate in opposite directions.

(b) The relative speed of the gears is calculated by the expression: rev/min driver / rev/min driven = number of teeth on driven / number of teeth on driver

Example

Calculate the speed of the driven gear if the driving gear is rotating at 150 rev/min. The driven gear has 180 teeth and the driving gear has 60 teeth:

150/rev/min driven  = 180 / 60; ==>> rev/min driven = (150 x 60)/180 = 50rev/min

The available tools above can be applied to the transmission of  bicycles. Calculation can be done for the following:

(1) the transmission (2) the transmission relative to a certain gear (3) the distance per turn of the pedal (in m or ft) (4) the speed at a certain cadence (in km/h or mi/h) (5) the cadence needed for a certain speed and (6) the number of pedal turns needed for a distance (km or mi).