1. What is the RPM to MPH Conversion?

The RPM to MPH conversion calculates how fast a bicycle is traveling based on pedal rotation speed (RPM) and wheel circumference. This helps cyclists understand their speed without electronic speedometers.

2. How Does the Calculator Work?

The calculator uses the following formula:

Where:

• \( RPM \) — Pedal rotations per minute
• \( Wheel\ Circumference \) — Distance wheel travels in one rotation (inches)
• 60 — Converts minutes to hours
• 12 — Converts inches to feet
• 5280 — Converts feet to miles

Explanation: The formula converts pedal rotations to wheel rotations (based on gear ratio), then calculates distance traveled per hour, finally converting to miles per hour.

3. Importance of RPM to MPH Calculation

Details: Understanding this conversion helps cyclists maintain optimal cadence for efficiency, track performance, and estimate speed when riding without a speedometer.

4. Using the Calculator

Tips: Measure your wheel circumference accurately (or use standard sizes: ~82" for 700c wheels, ~86" for 29" MTB wheels). RPM should be your actual pedal rotation speed, not wheel rotation speed.

5. Frequently Asked Questions (FAQ)

Q1: Does this account for gear ratios?
A: No, this assumes 1:1 gear ratio between pedals and wheel. For accurate results, measure wheel circumference directly.

Q2: What's a typical bicycle wheel circumference?
A: Common sizes: ~82" (700x23c road bike), ~86" (29" MTB), ~78" (27.5" MTB). Exact size depends on tire pressure and tread.

Q3: How do I measure my wheel circumference?
A: Roll the bike one full wheel revolution and measure distance traveled, or calculate from tire size: circumference = π × diameter.

Q4: What's a good RPM range for cycling?
A: Most cyclists aim for 80-100 RPM for optimal efficiency and reduced knee strain.

Q5: Why is wheel circumference important?
A: Larger wheels travel farther per rotation, significantly affecting speed calculations at the same RPM.