1. What is the Speed Calculation Formula?

The speed calculation formula estimates bicycle speed based on pedaling cadence and gear ratio (expressed in gear inches). It provides a theoretical speed that doesn't account for factors like wind resistance or terrain.

2. How Does the Calculator Work?

The calculator uses the speed formula:

Where:

• \( Cadence \) — Pedaling rate in revolutions per minute (rpm)
• \( Gear\ Inches \) — Effective diameter of the drive wheel in inches
• \( \pi \) — Mathematical constant pi (~3.14159)
• 1056 — Conversion factor for inches and minutes to miles per hour

Explanation: The formula converts the rotational speed of the pedals into linear speed based on the gear ratio and wheel size.

3. Importance of Gear Ratio Calculation

Details: Understanding the relationship between cadence, gear ratio, and speed helps cyclists optimize their pedaling efficiency and select appropriate gears for different conditions.

4. Using the Calculator

Tips: Enter cadence in rpm (typically 60-100 for most cyclists) and gear inches (can be calculated from chainring/sprocket sizes and wheel diameter). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical cadence range?
A: Most cyclists maintain 60-100 rpm, with 80-90 rpm being optimal for many riders.

Q2: How do I calculate gear inches?
A: Gear inches = (Chainring teeth / Cog teeth) × Wheel diameter in inches.

Q3: Why doesn't my actual speed match this calculation?
A: This is theoretical speed. Actual speed is affected by wind resistance, tire pressure, terrain, and riding position.

Q4: What gear inches are good for mountain biking?
A: Trail riding typically uses 20-35 gear inches, while downhill may use 25-50 gear inches depending on conditions.

Q5: Does this work for fixed-gear bikes?
A: Yes, but remember fixed-gear riders can't coast, so cadence directly relates to wheel speed.