In the process of pedaling, every tooth of the rear wheel gear will contact the chain once, so the number of pedaling cycles is related to the number of teeth of the gear. Because the design of bicycle considers that pedaling can't end in integer place forever, the tail cutting method is adopted when calculating the maximum pedaling cycle number, that is, the decimal place reached by pedaling is rounded to integer place to ensure the accuracy of calculation.
The gear system of bicycle is a high-precision technical structure, involving a variety of mathematical knowledge and physical principles.