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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 5-51 and Loading the
Vehicle on page 4-35.
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 5-58.
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 5-62.
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 4-35.
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 4-35.
5-50 Service and Appearance Care