Gear Ratio Formula:
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Definition: This calculator computes the differential gear ratio of a car based on the number of teeth in the ring gear and pinion gear.
Purpose: It helps automotive professionals and enthusiasts determine the gear ratio which affects vehicle performance, acceleration, and fuel efficiency.
The calculator uses the formula:
Where:
Explanation: The gear ratio determines how many times the driveshaft must rotate to turn the wheels once.
Details: Proper gear ratio selection affects torque multiplication, top speed, and engine RPM at cruising speeds.
Tips: Enter the number of teeth for both the ring gear and pinion gear. Both values must be positive integers.
Q1: What is a typical gear ratio for passenger cars?
A: Most passenger cars have gear ratios between 2.5:1 and 4.5:1.
Q2: How does gear ratio affect performance?
A: Higher ratios (numerically larger) provide better acceleration but lower top speed, while lower ratios improve fuel economy at highway speeds.
Q3: Where can I find my ring and pinion gear teeth count?
A: This information is often stamped on the differential housing or available in the vehicle's service manual.
Q4: Can I use this for other gear systems?
A: Yes, this formula works for any simple gear pair, not just automotive differentials.
Q5: What's the difference between gear ratio and final drive ratio?
A: Final drive ratio includes transmission gear ratios multiplied by the differential ratio.