General Description; Certification Label; Tire Load Limits And Inflation Pressure; Puncture-Sealing Tires - GMC G Service Manual

3E-2 WHEELS AND TIRES
This section details special service procedures that are
not covered in the vehicle's Owner's Manual. For jacking
instructions, basic tire changing and rotation instructions,
and a detailed explanation of all other owner-oriented infor­
mation, refer to the proper section in the vehicle Owner's
Manual.

CERTIFICATION LABEL

The certification label contains information used to
determine which tire size and type the vehicle uses. For
further information, refer to GENERAL INFORMATION
(SEC. OA).
TIRE LOAD LIMITS AND
INFLATION PRESSURE
The factory installed wheels and tires are designed to
handle loads up to and including their rated load capacity
when inflated to the recommended inflation pressures.
Refer to "Tire Load Limits And Inflation Pressure" at the end
of this section.
Correct tire pressures and driving techniques influence
tire life. Underinflated tires can cause handling problems,
poor fuel economy, shortened tire life, and tire overloading.
Heavy cornering, excessively rapid acceleration, and
unnecessary braking also increase tire wear.
Important
m
The use of wheels and/or tires with higher load
capacity ratings than originally equipped on the vehi­
cle will not increase the Gross Axle Weight Rating
(GAWR) or Gross Vehicle Weight Rating (GVWR) of
the vehicle.

PUNCTURE-SEALING TIRES

The puncture-sealing tire is designed to permanently
seal most tread punctures up to 3/16 inch in diameter, so
that the tire remains inflated. The actual sealant is made of

GENERAL DESCRIPTION

a special rubber compound which is applied to the tire in the
tire manufacturing plant. The sealant only covers the inside
of the tire under the tread area. The sealant is designed to
surround the embedded object and seal the puncture at the
inner surface of the tire below the tread. If a nail or other
puncturing object 3/16 inch in diameter or less penetrates
the tire tread into the sealant layer, it picks up a coating of
the sealant. As the puncturing object is either removed or
thrown from the tire by centrifugal force, the sealant
adheres to it and is pulled into the puncture opening in the
tread (figure 1). When the object is completely removed,
the sealant fills the entire puncture opening, keeping the tire
inflated and forming a permanent seal.
Puncture-sealing tires can be identified by a distinctive
marking on the sidewall, and carry a special warranty.
Puncture-sealing tires can be serviced with current tire
changing and wheel balancing equipment.