Cadillac XT4 Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
16412876) - 2023 - CRC - 3/25/22
372 Vehicle Care
Speed Rating : An
alphanumeric code
assigned to a tire indicating
the maximum speed at
which a tire can operate.
Traction
: The friction
between the tire and the
road surface. The amount
of grip provided.
Tread
: The portion of a
tire that comes into
contact with the road.
Treadwear Indicators
:
Narrow bands, sometimes
called wear bars, that show
across the tread of a tire
when only 1.6 mm (1/16 in)
of tread remains. See
When It Is Time for New
Tires 0 382.
UTQGS (Uniform Tire
Quality Grading
Standards)
: A tire
information system that
provides consumers with
ratings for a tire's traction,
temperature, and
treadwear. Ratings are
determined by tire
manufacturers using
government testing
procedures. The ratings
are molded into the
sidewall of the tire. See
Uniform Tire Quality
Grading 0 385.
Vehicle Capacity Weight
:
The number of designated
seating positions multiplied
by 68 kg (150 lbs) plus the
rated cargo load. See
Vehicle Load Limits 0 242.
Vehicle Maximum Load on
the Tire
: Load on an
individual tire due to curb
weight, accessory weight,
occupant weight, and cargo
weight.
Vehicle Placard
: A label
permanently attached to a
vehicle showing the
vehicle's capacity weight
and the original equipment
tire size and recommended
inflation pressure . See “Tire
and Loading Information
Label” under Vehicle Load
Limits 0 242.
Tire Pressure
Tires need the correct
amount of air pressure to
operate effectively.
{
Warning
Neither tire underinflation
nor overinflation is good.
Underinflated tires,
or tires that do not have
enough air, can result in:
.
Tire overloading and
overheating, which
could lead to a blowout
.
Premature or
irregular wear
.
Poor handling
(Continued)