Max Pressure on a tire and OE tire pressure
04-07-2008, 02:51 PM
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Max Pressure on a tire and OE tire pressure
I read this on the Discount Tire forum.. is this accurate???
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Pay attention to the max pressure. If your OEM tire max pressure was 44 psi max and you replace it with 51 psi max (with the same load rating), you need to scale the operating pressure as well. Say your car OEM sticker says 33 psi. The new pressure for the 51 psi max rated tire is 33*51/44 = 38.25 psi. If your new tire load rating is different then the old one you need to factor it in. Say, if your old tire was 94H (1477 lbs max) and the new one is 95H (1521 lbs max) , the calculation is 33*51/44*1477/1521 = 37.14 psi. You will get better milage and longer tread life.
=====================================
Pay attention to the max pressure. If your OEM tire max pressure was 44 psi max and you replace it with 51 psi max (with the same load rating), you need to scale the operating pressure as well. Say your car OEM sticker says 33 psi. The new pressure for the 51 psi max rated tire is 33*51/44 = 38.25 psi. If your new tire load rating is different then the old one you need to factor it in. Say, if your old tire was 94H (1477 lbs max) and the new one is 95H (1521 lbs max) , the calculation is 33*51/44*1477/1521 = 37.14 psi. You will get better milage and longer tread life.
04-08-2008, 08:40 AM
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Dont confuse max pressure and load rating. Plus a rant.
My guess is that you should adjust pressure to compensate for tire capacity ( size, load rating). Load rating, incidentally, is proportional to air pressure, and limited by sidewall strength.
Max air pressure, on the other hand, is a simple limit of sidewall strength. It should have no interaction with the ideal air pressure to support a give car's weight.
Finally, dont assume the recommended pressure yields th bets handling and/or wear. I get bette rwear from one of my cars at +3 lbs all around. Or witness the Ford Explorer debacle, where they recomended an unsafe pressure to make the (lousy) ride better.
Grant
Max air pressure, on the other hand, is a simple limit of sidewall strength. It should have no interaction with the ideal air pressure to support a give car's weight.
Finally, dont assume the recommended pressure yields th bets handling and/or wear. I get bette rwear from one of my cars at +3 lbs all around. Or witness the Ford Explorer debacle, where they recomended an unsafe pressure to make the (lousy) ride better.
Grant
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