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Underinflated Tire Marking

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When you check the chalk lines on your tires after driving back and forth, you’ll be able to tell whether they are underinflated like the tire in this photo. It had the chalk worn off the outside edges because the center area of the tread pattern was not rubbing against the asphalt while the truck was rolled back and forth a few times in a straight line. A check with the tire gauge showed this tire was more than 15 psi below the eventual optimal pressure, which explains why the center of the tread was not being pushed into the driving surface.