Explanation of gear inch and other units for expressing bicycle drivetrain effective gear ratios.
Updated: 16/11/2018. This post explains what bicycle gear ratios are (often expressed in gear-inches), how they work, what are the needed gear ratio ranges etc. 1. How do bicycle gear ratios function? Bicycle is driven by transferring pedaling force to the rear wheel. When pedals are turned, front chainring draws the chain, which goes … Read more Bicycle gear ratios – gear inches