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Motorsigma

Tools

Tools

Calculators and worksheets for the paddock. Each tool shows its formulas and assumptions, states what it can't tell you, and links to the guide that covers the decision behind the numbers.

Kart gear ratio & rollout calculator

Final drive ratio, rollout per engine revolution, and theoretical speed from your sprockets and tyre — with a sprocket-change comparison and a nearby-axle-sprocket table.

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