Ford Vehicle Owner's Manual page 337

Make sure that all replacement tires are of
the same size, type, load-carrying capacity,
and tread design (e.g. "All Terrain", etc.),
as originally offered by Ford.
Do not replace your tires with "high
performance" tires or larger size tires.
Use of aftermarket wheel assemblies may
damage your vehicle or cause accidents
resulting in serious injuries.
Failure to follow these precautions may
adversely affect the handling of the
vehicle and make it easier to lose control
and roll over.
Tires that are larger or smaller than your
vehicle's original tires may also affect the
accuracy of your speedometer.
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