Maximum Loaded Vehicle
Weight: The sum of curb
weight, accessory weight,
vehicle capacity weight, and
production options weight.
Normal Occupant Weight
:
The number of occupants
a vehicle is designed to seat
multiplied by 150 lbs (68 kg).
See Loading the Vehicle
on page 8-30.
Occupant Distribution
:
Designated seating positions.
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 9-47 and Loading the
Vehicle on page 8-30.
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 9-54.
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 9-57.
9-46 Vehicle Service and Care
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