GMC 2004 Sierra - Manual (Page 486)

Tire Inspection and Rotation
Tires should be rotated every 5,000 to 8,000 miles
(8 000 to 13 000 km).
Any time you notice unusual wear, rotate your tires as
soon as possible and check wheel alignment. Also
check for damaged tires or wheels. See
When It Is Time
for New Tires on page 5-88 and Wheel Replacement
on page 5-92 for more information.
Make sure the spare tire is stored securely. Push, pull,
and then try to rotate or turn the tire. If it moves,
use the wheel wrench/hoist shaft to tighten the cable.
See
Changing a Flat Tire on page 5-96.
If your vehicle has dual rear wheels, also see Dual Tire
Operation on page 5-85.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The first rotation
is the most important. See
Scheduled Maintenance
on page 6-4, for scheduled rotation intervals.
If your vehicle has single rear wheels and the tread
design for your front tires is the same as your rear tires,
use the rotation pattern shown here when rotating
your tires.
5-86