This online tool assists cyclists in determining gear ratios and their resulting speed and cadence. Users input data regarding their bicycle’s chainring teeth, cog teeth, wheel size, and crank length, and the tool calculates development (the distance traveled with one crank revolution), gear inches (a traditional measure of gear ratios), and potential speed at a given cadence. An example scenario might involve comparing the climbing ability afforded by different cassette options.
Created by the late bicycle mechanic and online cycling resource authority Sheldon Brown, this resource has become invaluable for cyclists seeking to optimize their drivetrains for specific needs, whether racing, touring, or commuting. By understanding the relationship between gear ratios, cadence, and speed, cyclists can make informed choices about component selection, ultimately improving performance and efficiency. Its ongoing utility highlights its enduring legacy and the importance of readily accessible technical cycling information.