Truck Tire Grooving And Tuning - Tune Your Tires
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At 5 psi the difference between the stock and tuned tires was nearly 1 1/2 inches, and at 3 psi the tuned tire has completely enveloped the rock, and then some (making the gauge read 4 psi). Some bias tires will grow about an inch in diameter when fully inflated as the tuned tread flexes better both ways. View Related Article
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