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Gain ratio
From WikiPedalia
One of the three comprehensive systems for numbering the gear values for bicycle gears. It is the only system that takes crank length into account, giving a true value for the relative leverage of different gears on bicycles with different size wheels and cranks. Gain ratio has the further advantage of not needing any units. It is a pure ratio, and is the same whether you use metric or inch-based units to calculate it. See also gear inch and development.
For more detail on gain ratios, see my article on the subject.
You can calculate gain ratios., gear inches or meters development. with my Online Gear Calculator or with your slide rule
