Re: tire pressure check
Tire pressure recommendations are set for not only ride, but fuel mileage, and safety; with safety always overriding the other two. The weight of the vehicle, type of vehicle, GVWR, etc., are used to determine not only the tire size, but the pressure they should be set at; when cold.
Too high of a pressure can cause the tire to be more susceptible to damage due to sharp objects, too low causes too much internal friction when driving on hot days or very long trips. The reason for the max pressure stamped on the tire is that the tire manufacturer knows sometimes the tire has to be inflated higher than the recommended pressure. (Autocrossers go to max for cornering, off-roading where the tire will be running on the outer edge, is a few examples.)
GM (or any other manufacturer) does not pull these recommendations out of a big hole, they put hundreds of thousands of miles on these tires during testing at Milford. Therefore, the recommended pressure is what the tires should be set at when the tires are cold.
The Goodyear Wranglers that are used on the H3 have softer sidewalls than the Bridgestones so they might appear to be low, but if the pressure is at 30 psi on a cold tire, than the pressure is correct.
But, they are your tires. Just remember, for every ten degrees of temperature increase, the tires gain one psi, this includes the temperature increase due to the heat generated when the tire is rolllng down the road.
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Black Sheep Hummer Squadron
(ME TOO)
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