CHEVROLET 2012 Express - Manual (Page 320)

Black plate (56,1) Chevrolet Express Owner Manual - 2012
10-56 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 on page 10‑64.
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 10‑68.
Vehicle Capacity Weight :
The number of designated
seating positions multiplied by
68 kg (150 lbs) plus the rated
cargo load. See Vehicle Load
Limits on page 9‑11.
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 9‑11.
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.