1. What is the Bicycle Speed Formula?

The bicycle speed formula calculates how fast a bicycle is moving based on pedaling rate (RPM), gear ratio, and wheel size. It helps cyclists understand their performance and optimize their gear selection.

2. How Does the Calculator Work?

The calculator uses the bicycle speed formula:

Where:

• \( RPM \) — Pedal revolutions per minute
• \( Gear\ ratio \) — Chainring teeth divided by cog teeth
• \( Wheel\ circumference \) — Wheel size in inches
• 336 — Conversion factor to get miles per hour

Explanation: The formula converts pedal rotations into linear speed by accounting for gear reduction and wheel size.

3. Importance of Bicycle Speed Calculation

Details: Knowing your speed helps with training, pacing, and gear selection. It's essential for competitive cyclists and those tracking fitness progress.

4. Using the Calculator

Tips: Enter RPM (typically 60-100 for most cyclists), gear ratio (e.g., 2.5 for 50/20 gearing), and wheel circumference (standard road bike is about 82 inches). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical RPM range for cycling?
A: Most cyclists maintain 60-90 RPM. Professional cyclists often pedal at 80-100 RPM.

Q2: How do I find my gear ratio?
A: Divide the number of teeth on your chainring by the number of teeth on your rear cog.

Q3: Where can I find my wheel circumference?
A: Measure it directly or check manufacturer specifications. Common sizes: 700c road bike ≈ 82", 26" MTB ≈ 79".

Q4: Why does the formula use 336?
A: This converts inches per minute to miles per hour (12 inches/foot × 5280 feet/mile ÷ 60 minutes/hour).

Q5: How accurate is this calculation?
A: It's theoretically accurate but doesn't account for factors like tire pressure, rider position, or road conditions.