Ford 1996 Aspire Manual page 201

Rotating the tires
Replacing the Tires
We recommend you use all weather tires when
you replace your tires.
Replace any tires that show wear bands. When
your tire shows a wear band, it has only 1/16
inch (2 mm) of tread left.
A worn-out tire
Because your vehicle's tires may wear unevenly,
you may need to replace them before a wear
band appears across the entire tread. Some spots
wear more heavily than others.
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