1. What is a Bike RPM to MPH Calculator?

Definition: This calculator estimates the speed of a bicycle in miles per hour based on pedal revolutions per minute (RPM) and tire diameter.

Purpose: It helps cyclists understand their speed based on cadence and bike specifications, useful for training and gear selection.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Speed (miles per hour)
• \( RPM \) — Pedal revolutions per minute
• \( \pi \) — Pi (approximately 3.1416)
• \( TD \) — Tire diameter (inches)
• 1056 — Conversion factor (combines inches to miles and minutes to hours)

Explanation: The formula calculates the distance traveled per minute based on wheel circumference and RPM, then converts it to miles per hour.

3. Importance of RPM to Speed Calculation

Details: Understanding this relationship helps cyclists optimize their pedaling efficiency, select appropriate gears, and track performance improvements.

4. Using the Calculator

Tips: Enter your cycling RPM (typically 60-100 for most riders) and your bike's tire diameter in inches. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical cycling RPM?
A: Most cyclists maintain 60-90 RPM, with 80-90 being optimal for endurance riding.

Q2: How do I measure my tire diameter?
A: Check the sidewall of your tire for size markings (e.g., 700x25c or 26x2.1) or measure directly from ground to axle center and double it.

Q3: Does this account for gear ratios?
A: No, this assumes a 1:1 gear ratio. For geared bikes, you'd need to factor in your specific gear ratio.

Q4: Why is the conversion factor 1056?
A: It combines 12 (inches/foot) × 5280 (feet/mile) ÷ 60 (minutes/hour) = 1056.

Q5: How accurate is this calculation?
A: It provides theoretical speed. Actual speed may vary due to tire pressure, surface conditions, and riding position.