335
Operation
Tires and wheels
TIN (Tire Identification Number)
Unique identifier which facilitates ef-
forts by tire manufacturers to notify pur-
chasers in recall situations or other safety
matters concerning tires and gives pur-
chases the means to easily identify such
tires. The TIN is comprised of “Manufac-
turer’s identification mark”, “Tire size”,
“Tire type code” and “Date of manufac-
ture”.
Tire load rating
Numerical code associated with the
maximum load a tire can support.
Tire ply composition and material used
This indicates the number of plies or the
number of layers of rubber-coated fabric
in the tire tread and sidewall. Tire manu-
facturers also must indicate the ply mate-
rials in the tire and sidewall, which
include steel, nylon, polyester, and oth-
ers.
Tire speed rating
Part of tire designation; indicates the
speed range for which a tire is approved.
Total load limit
Rated cargo and luggage load plus
68 kilograms (150 lb) times the vehicle’s
designated seating capacity.
Traction
Force exerted by the vehicle on the road
via the tires. The amount of grip provid-
ed.
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
in (1.6 mm) of
tread remains.
Uniform Tire Quality Grading Standards
A tire information system that provides
consumers with ratings for a tire’s trac-
tion, temperature and treadwear. Rat-
ings are determined by tire
manufacturers using government testing
procedures. The ratings are molded into
the sidewall of the tire.
Vehicle maximum load on the tire
Load on an individual tire that is
determined by distributing to each axle
its share of the maximum loaded vehicle
weight and dividing it by two.
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