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Recommended Inflation Pressure: Vehicle
manufacturer’s recommended tire inflation
pressure as shown on the tire placard. See
Inflation - Tire Pressure on page 362 and Loading
Your Vehicle on page 279.
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 369.
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 372.
Vehicle Capacity Weight: The number of
designated seating positions multiplied by 150 lbs
(68 kg) plus the rated cargo load. See Loading
Your Vehicle on page 279.
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
Your Vehicle on page 279.
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