1. What is the Gear Ratio Speed Formula?

The Gear Ratio Speed Formula calculates vehicle speed in miles per hour based on engine RPM, tire circumference, and gear ratio. It provides an accurate estimation of vehicle speed under specific mechanical conditions.

2. How Does the Calculator Work?

The calculator uses the speed formula:

Where:

• \( RPM \) — Engine revolutions per minute
• \( C_{tire} \) — Tire circumference in inches
• \( GR \) — Gear ratio (unitless)
• 60 — Conversion factor for minutes to hours
• 63360 — Conversion factor for inches to miles

Explanation: The formula calculates how far the vehicle travels per hour based on engine rotation speed, tire size, and gear reduction ratio.

3. Importance of Speed Calculation

Details: Accurate speed calculation is crucial for vehicle performance tuning, gear ratio selection, and understanding the relationship between engine RPM and vehicle speed.

4. Using the Calculator

Tips: Enter RPM (revolutions per minute), tire circumference in inches, and gear ratio (unitless). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is tire circumference used instead of diameter?
A: Circumference directly relates to the distance traveled per revolution, making it more accurate for speed calculations.

Q2: How do I measure tire circumference?
A: Measure the distance around the outside of the tire, or calculate it using the formula: circumference = π × diameter.

Q3: What is a typical gear ratio range?
A: Gear ratios typically range from 2.5:1 to 4.5:1 for most vehicles, but can vary significantly based on vehicle type and purpose.

Q4: Does this formula account for tire slippage?
A: No, this formula calculates theoretical speed. Actual speed may vary due to tire slippage, load, and other factors.

Q5: Can this be used for different measurement units?
A: This specific formula is designed for miles per hour. For other units, different conversion factors would be needed.