TYRE PRESSURE CALCULATOR

Optimise your off-road adventures with the AAV Tyre Pressure Calculator! This tool helps you determine the ideal tyre pressure for different terrains, ensuring better traction, a smoother ride, and increased tyre longevity.

To use the calculator: 
  1. Weigh the front axle in its normal loaded configuration
  2. On the top line enter the maximum tyre load e.g.
    • 129Q = 1850Kg
    • 131Q = 1950Kg
    • 135Q = 2180Kg
    • 137Q = 2300kg
  3. On the second line enter the maximum cold inflation pressure (found on tyre side wall)
  4. On the third line enter the front axle load
  5. On the fourth line enter the maximum load capacity of the rim (stamped on the face plate)
    • AAV rims are:
    • 2180Kg up to 2021
    • 2300Kg 2021 onwards 
  6. REPEAT the exercise for the rear axle load in its normal loaded configuration
  7. The calculator will automatically deliver the correct pressures for varying road conditions AND the maximum speed for such pressures. 
 
This calculator is for single vehicles only and is not designed when towing, as the ball weight is significantly variable over undulating terrain. 
The ideal front to rear load ratio is 50/50. The closest possible you can get to this maximises the vehicles ability.
 
When towing we recommend maximum pressure as per the side wall for the rear axle 
 
DISCLAIMER: This is NOT a prescriptive calculator. It is intended as general advice as a good starting point for tyre pressures in off-road applications ONLY. It has been based on an amalgamation of public data from various tyre manufacturers as well as off-road tyre manufacturers. The values represented are for single vehicle use ONLY and does NOT apply for towing. ALL tyre manufacturers will only warrant their tyres if they are operated at the pressure as represented on the tyre side wall. It is provided ‘as is’ without any claim of fitness for purpose.
Created by Rick Brake for the exclusive use of AAV.
Download Our Tyre Pressure Calculator Here!

Check out our Examples here

Rear Axle Weight with Federal Xplorer's on 17x9" Rims

Rear Axle Weight with Goodride Tyres on a 19.5" Rim

The 19.5 rim tyre combination is a high load carrying 14 ply tyre. With the recommended
pressure at around 100PSI it will give an excessively hard ride. As they are not a flotation
tyre running below 50PSI is not recommended.

Weigh Bridge Certificate

Here is a made-up example of a weighbridge configuration of an Isuzu NPS Crew cab that is towing.
Note: The GVM is 7250Kg, which is over the 7000Kg allocated for a 17×9” tyre. Do not
forget the full passenger load should it be weighed only with the driver.
Note: The GCM is 10520 Kg, which is slightly over the allowed GCM. With a full passenger
load it may be illegal.
Note: It is important to talk of axle loads, not only of the GVM. The front axle load is
2560Kg and the rear is 4700Kg. A repositioning of the load forward of the rear axle will help balance the load.
The Tyre Pressure Calculation (to the right) highlights the overloaded issues.

Rear WARNING Overload

The addition of an AAV TPMS internal mounted system will further allow the monitoring of both tyre pressures and tyre temperature. Should your tyre pressure or temperature increase beyond the 10 to 12% range from cold to hot, this is a clear indication the tyre is struggling with the load and potentially overloaded and /or underinflated.
 

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