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Gear Ratio Calculator Bicycle Speed

Bicycle Speed Formula:

\[ \text{Speed} = \frac{\text{Cadence} \times \text{Gear Ratio} \times \text{Wheel Circumference}}{60} \]

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1. What is a Bicycle Speed Calculator?

Definition: This calculator estimates bicycle speed based on pedaling cadence, gear ratio (determined by chainring and cog sizes), and wheel circumference.

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

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Speed} = \frac{\text{Cadence} \times \text{Gear Ratio} \times \text{Wheel Circumference}}{60} \]

Where:

Explanation: The formula calculates how far the bike travels per minute based on pedaling rate and gearing, then converts to speed units.

3. Importance of Gear Ratio and Speed Calculation

Details: Understanding this relationship helps cyclists select appropriate gears for desired speeds and cadences, optimizing efficiency and performance.

4. Using the Calculator

Tips: Enter your cadence (typical 80-100 rpm), chainring and cog tooth counts, and wheel circumference (standard road bike ~2096mm). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical cadence?
A: Most cyclists maintain 80-100 rpm, with 90 rpm being a common efficient pedaling rate.

Q2: How do I find my wheel circumference?
A: Measure the distance traveled in one wheel revolution, or use standard values (700c road bike ~2096mm, 29" MTB ~2300mm).

Q3: Why does gear ratio matter?
A: Higher gear ratios (big chainring/small cog) produce more speed per pedal stroke but require more effort.

Q4: How accurate is this calculation?
A: It's theoretical - actual speed may vary due to tire pressure, surface, and riding position.

Q5: Can I calculate speed in mph?
A: Yes, use wheel circumference in inches and multiply result by 0.0373 to convert to mph.

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