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Gear Ratio & RPM
Gear Ratio & RPM
Engine RPM, gear ratio, final drive, and tire diameter into vehicle speed
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Engine RPM
Gear ratio
Diff ratio
Tire diameter (in)
mph = engineRpm × π × tireDia × 0.0254 × 60 / (gear × diff × 1609.344)
Speed (mph)
65.4
Speed (km/h)
105.2
Final drive
3.55
Wheel RPM
845
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Speedometer
Half-circle speedometer dial showing the computed vehicle speed.
65.4 mph · 105.2 km/h · 845 wheel rpm
65 mph
