1. What is Car Gear Ratio?

The car gear ratio represents the relationship between the rotational speed of the engine and the rotational speed of the axle. It indicates how many times the engine must rotate to make the axle complete one full rotation.

2. How Does the Calculator Work?

The calculator uses the gear ratio formula:

Where:

• \( GR_{car} \) — Gear ratio (unitless)
• \( Engine\ RPM_{car} \) — Engine revolutions per minute
• \( Axle\ RPM_{car} \) — Axle revolutions per minute

Explanation: The formula calculates the ratio between engine speed and axle speed, which determines the mechanical advantage and torque multiplication in the vehicle's drivetrain.

3. Importance of Gear Ratio Calculation

Details: Gear ratio calculation is crucial for vehicle performance optimization, fuel efficiency analysis, and proper transmission design. It affects acceleration, top speed, and towing capacity.

4. Using the Calculator

Tips: Enter engine RPM and axle RPM values. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical gear ratio range for passenger cars?
A: Most passenger cars have gear ratios between 2.5:1 and 4.5:1, depending on the transmission type and vehicle purpose.

Q2: How does gear ratio affect vehicle performance?
A: Lower gear ratios provide better acceleration and towing power, while higher gear ratios offer better fuel efficiency at highway speeds.

Q3: Can I calculate gear ratio from tire size and speed?
A: Yes, but you would need additional information about transmission ratios and differential ratios for a complete calculation.

Q4: Why is gear ratio unitless?
A: Gear ratio is a ratio of two RPM values (revolutions per minute), so the units cancel out, making it a dimensionless quantity.

Q5: How often should gear ratios be checked?
A: Gear ratios should be verified when modifying a vehicle's drivetrain, changing tire sizes, or when experiencing performance issues.