1. What is the Gear Ratio Speed Formula?

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( RPM \) — Engine revolutions per minute
• \( C \) — Tire circumference in inches
• \( GR \) — Gear ratio (unitless)
• 1056 — Conversion factor to miles per hour

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

3. Importance of Speed Calculation

Details: Accurate speed calculation is crucial for vehicle performance tuning, gear selection, and understanding how modifications will affect vehicle performance.

4. Using the Calculator

Tips: Enter RPM as revolutions per minute, tire circumference in inches, and gear ratio as a unitless value. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire circumference?
A: Measure the distance around the outside of the tire or calculate using tire diameter (Circumference = π × Diameter).

Q2: What is included in the gear ratio?
A: The gear ratio should include both transmission gear ratio and final drive ratio (GR = Transmission Ratio × Final Drive Ratio).

Q3: Why is there a conversion factor of 1056?
A: This factor converts inches per minute to miles per hour (12 inches/foot × 5280 feet/mile ÷ 60 minutes/hour = 1056).

Q4: Does this account for tire slip or deformation?
A: No, this formula provides theoretical speed. Actual speed may vary due to tire slip, deformation, and other factors.

Q5: Can this be used for any vehicle type?
A: Yes, the formula works for any wheeled vehicle as long as accurate measurements are provided.