1. What is the Bike Speed Equation?

The bike speed equation calculates your speed based on pedaling cadence, gear ratio, and wheel circumference. It helps cyclists understand how different gear combinations affect their speed at a given pedaling rate.

2. How Does the Calculator Work?

The calculator uses the bike speed equation:

Where:

• \( cadence \) — Pedaling rate in revolutions per minute (rpm)
• \( gear\_ratio \) — Ratio of front chainring teeth to rear cog teeth
• \( wheel\_circumference \) — Distance wheel travels in one revolution (meters)
• \( \pi \) — Mathematical constant pi (~3.14159)

Explanation: The equation converts your pedaling rate through the gear system to determine how fast the bike is moving.

3. Importance of Bike Speed Calculation

Details: Understanding this relationship helps cyclists select optimal gear ratios for different conditions and maintain efficient pedaling cadences.

4. Using the Calculator

Tips: Enter your typical cadence (usually 70-100 rpm for recreational cyclists), your current gear ratio (e.g., 2.5 for 50/20 gearing), and your wheel circumference (standard road bike ~2.1m).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical gear ratio?
A: Gear ratios vary widely but common road bike ratios range from 1.0 (easy climbing gear) to 4.0+ (hard sprinting gear).

Q2: How do I measure wheel circumference?
A: Measure from ground through axle to ground (wheel diameter) and multiply by π, or roll bike one revolution and measure distance.

Q3: What cadence should I aim for?
A: Most efficient cadence is typically 80-100 rpm, though this varies by rider and conditions.

Q4: Does this account for tire pressure or surface?
A: No, this calculates theoretical speed. Actual speed may vary due to rolling resistance, wind, etc.

Q5: Can I use this for different wheel sizes?
A: Yes, as long as you input the correct circumference for your specific wheel and tire combination.