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Speedometer Gear Calculator
Calculate the correct speedometer driven gear teeth for accurate speed readings
Gear Formula: $\text{Driven Gear Teeth} = \frac{\text{Drive Teeth} \times \text{Axle Ratio} \times \text{Tire Revs per Mile}}{\text{Constant}}$. Enter your vehicle specs below.
Transmission & Axle Parameters Input
Calculation Results
⚠️ Speedometer gears are manufactured with specific whole number teeth counts. Round your calculated result to the nearest available gear tooth count!