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Unbeknownst to most is the correct formula used to determine the recommended cold tire air pressures of any passenger automobile. Its pretty simple
The gross vehicle weight divided by one hundred (GVW in lb/100) equals the recommended tire PSI when cold.
For example: Your Vehicles weight with a full tank of fuel plus the load capacity of passengers and cargo. Lets say yours is 3700 pounds.
3700/100= the recommended cold PSI is 37.
The cold pressure recommendation is generally within 5 pounds on the tires PSI once it has warmed to road surface use tempature's. Heavier use such as road racing and drifting may cause the tire PSI to increase above these of course. Over loading the weight carrying capacity of the vehicle will also cause the tires PSI to increase and may cause failure,
Obviously there are lighter and heavier Gross weights among automobiles using the same size tires and thus the variances noted of a allowable maximum tire pressure on the tires sidewalls.
Its also important to remember that proper alignment settings of the vehicle is crucial to even tire wear and safety. It plays a role in how the tire makes contact with the road surface and thus the amount of heat created inside the tire, raising the PSI. Theres is a significant connection between tire inflation PSI and improper caster and toe in settings. Improper settings increase the amount of heat/friction created that directly affects the tires by inordinately increasing tire PSI under use, in as much safety and longevity.
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