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Originally Posted by CapriRacer
I just realized the missing piece of this puzzle:
For Standard Load (SL) Passenger Car tires, there are 3 possible pressures on the sidewall: 35 psi (where the max load occurrs), 44 psi, and 51 psi - the last 2 of which could be considered over-inflation.
So referring back to the page out of the Tire and Rim book ( www.barrystiretech.com/2005traloadtable.jpg), if the sidewall of a P225/60R16 were to say "Max Load 1609# at 35 psi", that would be correct, but it could also say "Max Load 1609#, Max Pressure 44 psi", or "Max Load 1609#, Max Pressure 51 psi." |
But what does it actually say? To me it looks like it's not rated for more than 35psi, so that should be the stated maximum. On that site, the author states:
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Increasing the inflation pressure increases the maximum load carrying capacity up to a maximum value. This maximum could be called the "Rating Point", but generally this is referred to as separate entities - the "Rated Load" and the "Rated Inflation Pressure"
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Regardless, any pressure lower than the stated maximum is not "over-inflated". However, any load greater than the rated load at intermediate pressures is certainly overloaded even if the load is less than the maximum sidewall load rating.