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Outward Facing Sidewall: The side of an
asymmetrical tire that has a particular side that
faces outward when mounted on a vehicle. The
side of the tire that contains a whitewall, bears
white lettering, or bears manufacturer, brand,
and/or model name molding that is higher or deeper
than the same moldings on the other sidewall of
the tire.
Passenger (P-Metric) Tire
: A tire used on
passenger cars and some light duty trucks and
multipurpose vehicles.
Recommended Inflation Pressure
: Vehicle
manufacturer’s recommended tire inflation pressure
as shown on the tire placard. See Inflation - Tire
Pressure on page 6-55 and Loading the Vehicle on
page 5-24.
Radial Ply Tire
: A pneumatic tire in which the
ply cords that extend to the beads are laid at
90 degrees to the centerline of the tread.
Rim
: A metal support for a tire and upon which
the tire beads are seated.
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 1/16 inch (1.6 mm) of tread
remains. See When It Is Time for New Tires on
page 6-64.
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 6-67.
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 5-24.
Vehicle Maximum Load on the Tire
: Load on an
individual tire due to curb weight, accessory
weight, occupant weight, and cargo weight.
6-54