1. What is the Bicycle Gearing Speed Formula?

The bicycle gearing speed formula calculates the speed of a bicycle based on the rider's cadence (RPM), the gear ratio, and the 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 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 for mph

Explanation: The formula converts the rotational speed of the pedals through the gear ratio to determine how fast the wheels turn, then calculates the linear speed based on wheel size.

3. Importance of Gear Ratio and RPM

Details: Understanding this relationship helps cyclists select appropriate gears for different conditions (hills, flats) and maintain efficient pedaling cadence (typically 80-100 RPM for road cycling).

4. Using the Calculator

Tips:

• Measure wheel circumference by rolling the bike one revolution and measuring distance
• Common road bike cadence is 80-100 RPM
• Gear ratio = (Chainring teeth) / (Cog teeth)

5. Frequently Asked Questions (FAQ)

Q1: What is a typical gear ratio for road bikes?
A: Common ratios range from 0.7 (easy gear) to 4.0 (hard gear), depending on chainring and cog sizes.

Q2: How does wheel size affect speed?
A: Larger wheels cover more distance per revolution, increasing speed at the same RPM and gear ratio.

Q3: What's the optimal cadence for cycling?
A: Most cyclists find 80-100 RPM most efficient, though this varies by individual and riding style.

Q4: How can I measure my wheel circumference?
A: Roll your bike one full wheel revolution and measure the distance traveled, or use manufacturer specifications.

Q5: Why is the conversion factor 336?
A: This converts inches per minute to miles per hour (12 inches/foot × 5280 feet/mile ÷ 60 minutes/hour).