Mercury 1996 Sable Manual page 319

Replacing the Tires
We recommend that 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 (1.59 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.
When replacing full size tires, never
mix radial, bias-belted, or bias-type
tires. Use only the tire sizes that are
listed on the tire pressure decal.
Make sure that all tires are the same
size, speed rating, and load-carrying
capacity. Use only the tire
combinations recommended on the
decal. If you do not follow these
precautions, your vehicle may not
drive properly and safely.
Tires that are larger or smaller than your
vehicle's original tires may also affect the
accuracy of your speedometer.
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