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I had my tires inflated to the max of 40 psi when I drove across country. In the desert in summer driving 85+, the tires started smacking the minor expansion joints in the pavement and vibrating through the car as if they were made of stone. I slowed down and checked the pressure at the next stop and it took probably half a minute of bleeding the air before it would even register on my pressure gauge (cheap stick maxed at 50). So that might not answer any questions, but be careful testing in extreme conditions. I'm amazed they didn't blow out.
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