FORD 1998 Explorer - Manual (Page 180)

• Five tire rotation
Replacing the tires
Replace the tires when the wear
band is visible through the tire
treads.
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.
Maintenance and care
180