Gear Ratio Speed Calculator
Calculate vehicle speeds in MPH based on engine RPM, tire diameter, transmission gear ratio, and rear axle ratio.
Interactive Calculator
1. Provide Details
RPM
in
:1
:1
2. Output Results
How to Calculate: Formula & Steps
Computes ground speed by determining wheel RPM and multiplying by tire circumference.
Formula Used:
Speed (MPH) = (RPM × Tire Diameter) ÷ (Transmission Ratio × Axle Ratio × 336)Step-by-Step Calculation Example
At 3,000 RPM with 26" tires, 1.0 transmission gear, and 3.73 axle, the speed is 62.2 MPH.
Common Mistakes to Avoid
- Confusing tire radius with tire diameter in inputs.
Practical Use Cases
- Drivetrain gearing optimizations
- Transmission speed checking
Expert Tips
- A lower gear ratio increases acceleration, while a higher ratio improves highway fuel efficiency.
Frequently Asked Questions About Gear Ratio Speed Calculator
What is axle ratio?
The ratio between the driveshaft rotations and differential axle rotations, indicating how many times the driveshaft spins to turn the wheels once.
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