After I bought my '99 Box, I drove to a gas station to gas up for the 500 mile drive home. Just as a precaution I checked the air pressure in the tires (18" Continentals), and immediately began cussing the worthless gas station air pressure gauge because it claimed the two rear tires had less than 15lb in them, whereas by eyeball they looked prefectly fine. I dribbled a little air into them, and the pressure on the gauge started to go up!
After pumping up the tires, I drove home and two days later the tires were down to 15lbs again. Examination showed nails in both tires, one of which had been run flat and required replacement.
The point here is that these ultra-low profile tires have such stiff sidewalls that they can be almost flat and still LOOK perfectly fine.
Taught me a lesson, anyway.
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