1. What is a Bike Gear Calculator Speed?

Definition: This calculator estimates cycling speed based on pedaling cadence, gear ratio, and wheel circumference.

Purpose: It helps cyclists understand how gear selection and pedaling rate affect their speed.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( S \) — Speed (km/h after conversion)
• \( Cadence \) — Pedaling rate (revolutions per minute)
• \( GR \) — Gear ratio (chainring teeth ÷ cog teeth)
• \( WheelCirc \) — Wheel circumference (meters)

Explanation: The formula calculates how far the bike travels per minute based on pedaling rate and gear ratio, then converts to km/h.

3. Importance of Gear Ratio Calculations

Details: Understanding gear ratios helps cyclists optimize pedaling efficiency and speed for different terrain and conditions.

4. Using the Calculator

Tips: Enter your cadence (typical 60-100 rpm), gear ratio (e.g. 50/12 ≈ 4.17), and wheel circumference (standard road bike ≈ 2.1m). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical cycling cadence?
A: Most cyclists maintain 80-100 rpm, with professional riders often pedaling at 90-110 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: How do I measure wheel circumference?
A: Measure from ground through axle to ground (rolling circumference), or calculate using wheel diameter (π × diameter).

Q4: Why multiply by 3.6 in the calculation?
A: The formula initially gives m/s; multiplying by 3.6 converts to km/h (1 m/s = 3.6 km/h).

Q5: Does this account for hills or wind resistance?
A: No, this calculates theoretical speed. Actual speed will vary based on terrain, wind, and rider power.