1. What is Wheel RPM?

Wheel RPM (Revolutions Per Minute) measures how many complete rotations a wheel makes in one minute. It's an important parameter in vehicle dynamics, performance tuning, and transmission design.

2. How Does the Calculator Work?

The calculator uses the Wheel RPM formula:

Where:

• Vehicle Speed — Speed of the vehicle in kilometers per hour
• Tire Diameter — Diameter of the tire in meters
• 1000 — Conversion from km to meters
• 60 — Conversion from hours to minutes
• π (pi) — Mathematical constant (~3.14159)

Explanation: The formula converts vehicle speed to meters per minute, then divides by the tire circumference to get revolutions per minute.

3. Importance of Wheel RPM Calculation

Details: Knowing wheel RPM helps in gear ratio selection, performance optimization, fuel efficiency calculations, and diagnosing drivetrain issues.

4. Using the Calculator

Tips: Enter vehicle speed in km/h and tire diameter in meters. Both values must be positive numbers. For accurate results, measure tire diameter when properly inflated and under load.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire diameter?
A: Measure from the ground to the top of the tire and multiply by 2, or calculate from tire size markings (e.g., 205/55R16).

Q2: Does wheel RPM change with speed?
A: Yes, wheel RPM increases linearly with vehicle speed for a given tire diameter.

Q3: Why use metric units in a UK calculator?
A: While the UK uses mph for speed, the automotive industry commonly uses metric measurements for technical calculations.

Q4: How does tire wear affect RPM?
A: As tires wear, diameter decreases, causing higher RPM at the same speed (about 1-2% change over tire life).

Q5: Can I use this for motorcycle wheels?
A: Yes, the formula works for any wheeled vehicle as long as you input the correct diameter.