1. What is the Wheel RPM Equation?

The Wheel RPM equation calculates the rotational speed of a vehicle's wheels based on the vehicle's speed and tire diameter. It's essential for automotive applications, performance tuning, and mechanical analysis.

2. How Does the Calculator Work?

The calculator uses the Wheel RPM equation:

Where:

• 336 — Conversion factor combining miles to inches and hours to minutes
• Vehicle Speed — Speed in miles per hour (mph)
• Tire Diameter — Diameter of the tire in inches

Explanation: The equation converts linear vehicle speed to rotational wheel speed accounting for tire size.

3. Importance of Wheel RPM Calculation

Details: Wheel RPM is crucial for gear ratio calculations, performance tuning, fuel efficiency analysis, and ensuring proper speedometer calibration.

4. Using the Calculator

Tips: Enter vehicle speed in mph and tire diameter in inches. Both values must be positive numbers. For accurate results, measure tire diameter when properly inflated.

5. Frequently Asked Questions (FAQ)

Q1: Why is 336 the conversion factor?
A: It combines 5280 feet/mile × 12 inches/foot ÷ 60 minutes/hour = 1056, then divided by π (3.1416) ≈ 336.

Q2: How do I measure tire diameter?
A: Measure from ground to top of tire (loaded radius) and multiply by 2, or use manufacturer specifications.

Q3: Does this work for metric units?
A: No, this formula is for mph and inches. For km/h and mm, a different conversion factor is needed.

Q4: How does wheel RPM relate to engine RPM?
A: Engine RPM = Wheel RPM × Overall gear ratio (transmission × differential).

Q5: Why is wheel RPM important for performance?
A: It helps determine optimal gear ratios for acceleration and top speed, and ensures tires aren't over-revving at high speeds.