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Tires and wheels
2 77
Tread separation
UTQG information on the tires,
•
means pulling away of the
molded into the sidewalls.
•
'
tread from the tire carcass.
U.S. DOT Tire Identification
Treadwear indicators (TWI)
Number (TIN)
means the projections within
This is the tire's "serial number"
the principal grooves designed
It begins with the letters "DOT"
to give a visual indication of the
and indicates that the tire
degrees of wear of the tread.
meets all federal standards.
See¢
page 289, Tread Wear
The next two numbers or let-
Indicator (TWI)
for more infor-
ters indicate the plant where it
mation on measuring tire wear.
was manufactured, and the last
Uniform Tire Quality Grading
four numbers represent the
week and year of manufacture.
is a tire information system de-
For example,
veloped by the United States
DOT ... 2214 ...
National Highway Traffic Safety
Administration (NHTSA) that is
means that the tire was pro-
designed to help buyers make
duced in the 22nd week of
relative comparisons among
2014. The other numbers are
tires. The UTQG is not a safety
marketing codes that may or
rating and not a guarantee that
may not be used by the tire
a tire will last for a prescribed
manufacturer. This information
number of miles (kilometers) or
is used to contact consumers if
perform in a certain way. It
a tire defect requires a recall.
simply gives tire buyers addi-
Vehicle capacity weight
tional information to combine
means the rated cargo and lug-
with other considerations, such
gage load plus 1
SO
lbs.
as price, brand loyalty and deal-
(68 kilograms) times the vehi-
er recommendations. Under
cle's total seating capacity as
UTQG, tires are graded by the
listed on the label located on
M
tire manufacturers in three
N
the driver's side 8-pillar.
0
...
...J
areas: treadwear, traction, and
'SI:
,....,
\!)
1.1'1
temperature resistance. The
,....,
1.1'1
,....,
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