Having read this thread, I have one question for all. Has anyone considered looking at the side of the tire?
They put a recomended air pressure there for a reason. If it says 90psi, put 90psi in it. It's not designed to be run on less.
Under-inflation causes crowning(outer treads wearing faster than inner treads), excessive heat generation and, in extreme cases, belt damage. this happens whether the tire is under a load or not.
Over-inflation causes cupping(inner treads wearing faster than outer treads), reduced traction under break and on wet surfaces and, in extreme cases, belt damage. This happens whether the tire is under a load or not.
The most common cause of blow-outs is under- or over-inflation.
There is a reason that recomended air pressure is branded into the side of your tires. Look at it and use it.
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