1. What is the Speed from Gear Ratio Equation?

The speed equation calculates vehicle speed based on engine RPM, tire diameter, and gear ratio. It's commonly used in automotive applications to determine theoretical speed at a given RPM in a specific gear.

2. How Does the Calculator Work?

The calculator uses the speed equation:

Where:

• \( RPM \) — Engine revolutions per minute
• \( Tire\ diameter \) — Diameter of tire in inches
• \( \pi \) — Mathematical constant (~3.1416)
• \( Gear\ ratio \) — Transmission gear ratio (decimal)
• 336 — Conversion factor (combines unit conversions)

Explanation: The equation accounts for the relationship between engine speed, tire size, and gear reduction to determine vehicle speed.

3. Importance of Speed Calculation

Details: Understanding the relationship between RPM and speed helps in gear selection, fuel efficiency optimization, and performance tuning.

4. Using the Calculator

Tips: Enter RPM (engine speed), tire diameter in inches, and gear ratio as a decimal (e.g., 3.73). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 336 used in the equation?
A: The 336 factor combines unit conversions (5280 feet/mile, 12 inches/foot, 60 minutes/hour) into one constant.

Q2: Does this account for tire slippage?
A: No, this calculates theoretical speed. Actual speed may vary due to tire slippage, inflation, and other factors.

Q3: What's a typical gear ratio range?
A: Final drive ratios typically range from 2.73 to 4.10 for passenger vehicles, with lower numbers for highway efficiency.

Q4: How does tire size affect speed?
A: Larger tires increase speed at a given RPM, while smaller tires decrease speed at the same RPM.

Q5: Can this be used for any vehicle?
A: Yes, as long as you have accurate RPM, tire diameter, and gear ratio values for the vehicle.