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 5-64.
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 5-65.
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 4-31.
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 original equipment tire size
and recommended inflation pressure. See Loading Your
Vehicle on page 4-31.
5-59
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