FORD 2001 Explorer Sport Trac - Manual (Page 205)

Tire rotation
Because your vehicle’s tires perform different jobs, they often wear
differently. To make sure your tires wear evenly and last longer, rotate
them as indicated in the scheduled maintenance guide. If you notice that
the tires wear unevenly, have them checked.
The following procedure applies to vehicles equipped with single rear
wheels.
• Four tire rotation
Maintenance and care
205