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Re: Tire Inflation ? said by MooJohn:The "use the factory sticker" approach makes the huge assumption that the tire itself doesn't matter. As long as you have a round tire with x psi, you're fine. That's not something I'm willing to blindly concede.
There is no way that the ideal inflation for one tire is the ideal for all on a given vehicle. If you change from a 16 to a 17 inch wheel, is that cushy 29 psi still ideal? If you go from a $50 no-name tire to an expensive Pilot Sport, is 29 still ideal?
That doesn't even address the factors that make up the "ideal" point either. What is ideal? Is it the softest ride? Is it the minimum without risking tire damage? Is it harmonically tuned to the suspension resonances? We just don't know. At the recommended pressure, my car rides like a Lincoln -- because it is one. At 35 it rides the way I want it to. Guess where it's staying?
The sticker is ok for the OEM-equipped tires only. After that, using it might not get you killed but there's no way it is certain to be the ideal pressure either. There are just too many variables to accept it as gospel.
I switched from 18" rims to 20" rims. When I first had the 20" rims on, I ran the tires at 40 PSI, then went back to 35 PSI like the door jamb said after finding the ride to be too rough and having less grip than the smaller stock sized tires. Once I dropped the pressure on the tires the ride became close to what it was like on the stock rims and the grip went up dramatically.
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