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Calcimator

RC Car Gear Ratio Calculator

Calculate final drive ratio and theoretical top speed for RC cars based on pinion, spur, diff ratio, and motor specs.

Inputs

Results

Final Drive Ratio

10

Theoretical Speed (mph)

26.4

Motor Max RPM22,200
Torque Multiplier10x
How to Use This Calculator
  1. Enter Pinion Teeth, Spur Gear Teeth, and Differential Ratio.
  2. Set Motor Kv Rating and Battery Voltage.
  3. Review Final Drive Ratio and Theoretical Speed (mph).
  4. Use Motor Max RPM and Torque Multiplier (x) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.
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