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"Follow the sticker on the door for any tire but do not inflate the new tire past its max stamped on the side."
That is mostly correect. You should not inflate to more than the "MAX" on the sidewall -COLD.
The door sticker is for OE tires ONLY, or their direct replacemets. Do you think that if you replaced the stock tires with some really good high-performance 50 PSI tires you should inflate them to 28 psi just because the door sticker says so? Of course not! Volvo (or whomever) has no way to know what future tire technology will be.
Still think you should follow the vehicle manufacturer's suggestions on inflation and not the TIRE mfgrs? Can you say Explorer/Firestone? Ahh, NOW you are understanding. It was FORD that set the pressures on the sticker too low, and Firestone told them not to. What did you get? Lots of wrecks and injured or killed people, because Ford did not listen to the TIRE mfgr on inflation.
Now, the TIRE mfgrs all know what inflation you need for any given tire at a specific load and speed. Do the auto mfgrs? No. How could they? The vehicle mfgrs are really concerned mostly with two things, ride quality and noise. Higher inflation pressures HURT BOTH. When you are in the business of selling cars, you want GOOD ride and low noise while having good handeling and economy. The vehicle mfgr chooses an inflation pressure that is at best, a compromise. Those pressure may VERY WELL be right at the very lower end of what is safe (Explorer), YOU don't know that, but the tire company does.
So who are YOU going to believe, the auto mfgr, or the TIRE mfgr? If you are having trouble answering that correctly here's a hint... ALL tires explode from UNDER inflation.
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JohnG 1989 245 MT @ 235,000
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