Chevrolet EXPRESS - 2011 Manual page 337

The tire has a bump, bulge,
or split.
The tire has a puncture, cut,
or other damage that cannot
be repaired well because of
the size or location of the
damage.
Tires should be rotated every
12 000 km (7,500 miles).
See
.
The purpose of a regular tire
rotation is to achieve a uniform
wear for all tires on the vehicle.
This will ensure that the vehicle
continues to perform most like it
did when the tires were new.
Any time you notice unusual
wear, rotate the tires as soon as
possible and check wheel
alignment. Also check for
damaged tires or wheels.
See
and
When rotating the vehicle's tires,
always use the correct rotation
pattern shown here.
The compact spare tire, if the
vehicle has one, is not included
in the tire rotation.
After the tires have been
rotated, adjust the front and rear
. inflation pressures as shown on
the Tire and Loading Information
label. See
and
Reset the Tire Pressure Monitor
System. See
.
.