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Development
From WikiPedalia
Development (also known as rollout), is one of the three comprehensive systems for numbering the gear values for bicycle gears. Development is the distance the bicycle travels for one crank revolution, and is usually measured in meters. Development can be calculated by dividing the chainwheel size by the rear sprocket size, multiplying the result by the wheel diameter and by pi (3.1416). See also gear inches and gain ratios.
You can calculate gain ratios., gear inches or meters development with my Online Gear Calculator or with your slide rule
