Enter the number of teeth on the ring gear and the number of teeth on the pinion into the Axle Ratio Calculator. The calculator will evaluate and display the Axle Ratio.
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Axle Ratio Formula
The following formula is used to calculate the Axle Ratio.
AXR = TRG / TP
- Where AXR is the Axle Ratio ( )
- TRG is the number of teeth on the ring gear
- TP is the number of teeth on the pinion
To calculate the axle ratio, divide the number of teeth on the ring gear by the number of teeth on the pinion.
How to Calculate Axle Ratio?
The following example problems outline how to calculate Axle Ratio.
Example Problem #1:
- First, determine the number of teeth on the ring gear.
- The number of teeth on the ring gear is given as: 25.
- Next, determine the number of teeth on the pinion.
- The number of teeth on the pinion is provided as: 30.
- Finally, calculate the Axle Ratio using the equation above:
AXR = TRG / TP
The values given above are inserted into the equation below and the solution is calculated:
AXR = 25 / 30 = .833 ( )
FAQ
What is an Axle Ratio and why is it important?
An Axle Ratio is a numerical value that represents the ratio between the number of teeth on the ring gear and the number of teeth on the pinion in a vehicle’s differential. It is important because it directly affects the vehicle’s performance, including its acceleration, fuel efficiency, and towing capacity. A lower axle ratio can improve fuel efficiency and speed, while a higher axle ratio can enhance towing power and acceleration.
How does changing the Axle Ratio affect a vehicle’s performance?
Changing the Axle Ratio can significantly alter a vehicle’s performance. A higher axle ratio (more teeth on the ring gear relative to the pinion) increases torque to the wheels, which improves towing capacity and acceleration but can reduce top speed and fuel efficiency. Conversely, a lower axle ratio (fewer teeth on the ring gear relative to the pinion) can increase top speed and improve fuel efficiency but may decrease towing capacity and acceleration.
Can I calculate the Axle Ratio for any vehicle?
Yes, you can calculate the Axle Ratio for any vehicle as long as you know the number of teeth on the ring gear and the number of teeth on the pinion. Using the formula AXR = TRG / TP, where AXR is the Axle Ratio, TRG is the number of teeth on the ring gear, and TP is the number of teeth on the pinion, you can determine the Axle Ratio for differentials in cars, trucks, and other vehicles.
