Friday, May 23, 2014 at 09:55
Kc, slightly tongue in cheek, but is that for crossply, Highway or Light truck tyre?
Both the 4psi or the load calculation is and always will be subject to ambient temperature, direct sunlight and running tyre temperature.
Which is why motor racing warm up their tyres and manufacturers provide COLD tyre pressure figures only.
So like the 4psi rule, the way you load the vehicle will effect the load on the tyre and change the required pressure.
Empty the front may be heavy (engine weight) so front tyre have more load, then a long range tank behind the rear axel will require tyre adjustment from full to empty.
As said earlier this, like the 4psi rule can only be a guideline, in
Australia there are too many variables to be absolutely accurate.
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