1. What is the RPM Calculation?

The RPM (Revolutions Per Minute) calculation converts cycling speed in km/h to pedal revolutions per minute, based on wheel circumference. This helps cyclists maintain optimal cadence for efficiency and performance.

2. How Does the Calculator Work?

The calculator uses the RPM equation:

Where:

• \( S_{kmh} \) — Cycling speed in kilometers per hour
• \( C \) — Wheel circumference in meters
• 1000/60 — Conversion factor (km to meters and hours to minutes)

Explanation: The equation converts speed to distance traveled per minute, then divides by wheel circumference to determine how many wheel revolutions occur each minute.

3. Importance of RPM Calculation

Details: Maintaining proper RPM (typically 80-100 for road cycling) helps prevent injury, improves endurance, and optimizes power output. This calculation helps cyclists match their pedaling cadence to desired speeds.

4. Using the Calculator

Tips: Enter your cycling speed in km/h and your wheel circumference in meters. Standard road bike wheel circumference is approximately 2.1 meters (700c wheels). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a good RPM range for cycling?
A: Most cyclists aim for 80-100 RPM, with 90 RPM often considered optimal for road cycling.

Q2: How do I measure my wheel circumference?
A: Measure from ground contact point through axle to ground again, or roll the wheel one revolution and measure distance traveled.

Q3: Does this account for different gear ratios?
A: No, this calculates wheel RPM. Actual pedal RPM depends on your gear ratio (chainring/sprocket).

Q4: Why is RPM important in cycling?
A: Proper RPM reduces muscle fatigue, improves efficiency, and helps maintain consistent power output.

Q5: How does tire pressure affect this calculation?
A: Higher pressure slightly increases wheel circumference as the tire bulges less, but the effect is minimal for this calculation.