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Speed Rating : An alphanume ric 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 1/16 inch (1.6 mm) of tread
remains. See When It Is Time for New Tires
on
page 6‑70
.
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 manufacture rs using
government testing procedu res. The ratings are
molded into the sidewall of the tire. See Uniform
Tire Quality Grading
on page 6‑73
.
Vehicle Capacity Weight
: The number of
designated seating positions multiplied by 150 lbs
(68 kg) plus the rated cargo load. See Loading the
Vehicle
on page 5‑32
.
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 Loading the
Vehicle
on page 5‑32
.
Inflation - Tire Pressure
Tires need the correct amount of air pressure to
operate effectively.
Notice: Do not let anyone tell you that
under‐inflation or over‐inflation is all right.
It is not. If your tires do not have enough air
(under‐inflation), you can get the following:
.
Too much flexing
.
Too much heat
.
Tire overloading
.
Premature or irregular wear
.
Poor handling
.
Reduced fuel economy
6-62