Gear Ratio Speed
Gear Ratio Speed Calculator
V = (RPM × C) / (GR × FD × 1056)
Where: V = vehicle speed in mph RPM = engine revolutions per minute C = tire circumference in inches GR = transmission gear ratio FD = final drive ratio 1056 = conversion constant
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Understanding Gear Ratios
Gear ratios determine how engine RPM translates to wheel speed. Lower (numerically higher) gear ratios provide more torque multiplication but lower top speed, while higher (numerically lower) ratios allow higher speeds but less acceleration.
Benefits:
- • Helps optimize gearing for specific track conditions
- • Allows calculation of optimal shift points
- • Useful for predicting top speed in each gear
- • Essential for transmission and differential setup
Key Considerations:
- • Shorter gearing (higher numerical ratio) improves acceleration
- • Taller gearing (lower numerical ratio) improves fuel economy
- • Final drive ratio affects all gears equally
- • Tire size changes effectively alter your overall gearing