Tire Pressure; Vehicle Care; Speed Rating- Page 309

Black plate (49,1)

Buick LaCrosse Owner Manual - 2013 - crc - 9/7/12

Vehicle Care

10-49

Sidewall

:

The portion of a tire

between the tread and the bead.

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
on page 10

‑

56

.

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 on
page 10

‑

59

.

Vehicle Capacity Weight

:

The

number of designated seating
positions multiplied by
68 kg (150 lb) plus the rated
cargo load. See

Vehicle Load

Limits on page 9

‑

10

.

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
capacity weight and the original
equipment tire size and

recommended inflation pressure.
See

“

Tire and Loading

Information Label

”

under

Vehicle

Load Limits on page 9

‑

10

.

Tire Pressure

Tires need the correct amount of
air pressure to operate
effectively.

Notice:

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.

.

Reduced fuel economy.