Ford Mercury Villager 1997 Owner's Manual page 305

Rotating the tires
After each rotation, adjust individual tire pressure as specified
on the Tire Pressure Decal. Tighten wheel lug nuts to the required
torque specification and retighten again after 500 miles (800
km).
If your vehicle has the optional full-size spare tire, you may
rotate the spare tire into the rotation pattern.
If you use the temporary spare tire continuously or do not
follow these precautions, the tire could fail, causing
you to lose control of the vehicle.
If your vehicle has aluminum wheels, you may remove the full-
size spare tire from the wheel and remount it on an
aluminum wheel to rotate the spare tire into your vehicle's
rotation pattern.
Replacing the Tires
Replace tires that show wear bands. When your tire shows a
wear band, it has only 1/16 of an inch (1.59 mm) of tread left.
Maintenance and Care
WARNING
301