Tire pressure question
A lot of funny answers. Since the tire is supporting weight and a tire is just an air container with a specific volume of air capacity the pressure is always dependent on load.
Find out what the axle weight of the vehicle is first.
Using water and chalk and anything other than a good quality air gauge is just too funny. And I would never admit to "being in the business" and giving such unprofessional advice about pressures. I have to assume you were talking about a car with the correct, factory sized tire on it.
The pressure on the side of the tire is Not a recommendation. It is the maximum safe tire pressure for that particular tire.
Look up a load and inflation chart to find the load capacity of the tires you are thinking of using. Now look up the factory tire that came on that car and look up the load capacity of that tire. The tire you want to use should have at least the same capacity at the same pressure as what the car came with. Armed with the actual axle weight you can see what the safe limits are for the amount air pressure used.
Do a little reading to educate yourself a little more on tires. Not complete but has some good info for the average guy.
Tire Load And Inflation Chart at Tire Rack
Registered to this forum to react.
I am yust a hobbyist " pigheaded Dutch self declared Tire-pressure specialist" .
But the quoted answer is the best to my opinion.
Remark is that the pressure/ load capacity lists found in US, often are made with the formula used before 2006, and give to high loadcapacity for the pressure.
In 2006 US stepped over, only for P tires, to the official calculation in Europe used for decades, for all kind of car tires.
I got hold of this calculation end 2007 and system, and went running with it.
I can calculate the needed pressure for you, but need real axleweights and max speed you use, and won't go over for even a minute.
Especially determining the weights is the most tricky part in it all.
But here a dangerous estimation.
Because light car with oversized tires, mayby even 20 psi can do.
Would like further contact with MopartLeo, maybe we can make each other wiser
Have made multilingual pressure calculators, and studied side subjects like Nitrogen filling, rimmwidth for section width and H/W division, and maxspeed / max load relation, and more.