1. What is Wheel RPM?

Wheel RPM (Revolutions Per Minute) measures how many complete rotations a wheel makes in one minute. It's a crucial parameter in vehicle dynamics, helping to understand speed, gear ratios, and engine performance.

2. How Does the Calculator Work?

The calculator uses the Wheel RPM formula:

Where:

• \( Speed \) — Vehicle speed in kilometers per hour
• \( Wheel\ Radius \) — Radius of the wheel in meters
• \( \pi \) — Mathematical constant Pi (~3.14159)

Explanation: The formula converts speed from km/h to m/min, then divides by the wheel circumference to get rotations per minute.

3. Importance of Wheel RPM Calculation

Details: Knowing wheel RPM helps in gear ratio selection, speedometer calibration, understanding engine load, and optimizing vehicle performance and fuel efficiency.

4. Using the Calculator

Tips: Enter speed in km/h and wheel radius in meters. Ensure values are positive numbers (speed > 0, radius > 0) for accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: How does wheel size affect RPM?
A: Larger wheels have lower RPM at the same speed compared to smaller wheels, as they cover more distance per rotation.

Q2: What's a typical wheel RPM range for cars?
A: At highway speeds (100 km/h), typical wheel RPM ranges between 800-1200 RPM depending on wheel size.

Q3: How do I measure wheel radius accurately?
A: Measure from wheel center to ground (loaded radius) or calculate from tire size markings (e.g., 205/55R16).

Q4: Can I use this for bicycle calculations?
A: Yes, the formula works for any wheeled vehicle including bicycles, motorcycles, and trucks.

Q5: How does RPM relate to engine RPM?
A: Engine RPM equals wheel RPM multiplied by the total gear ratio (transmission × final drive ratio).