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Tires
Vehicle care and maintenance 9-13
9
code may only be on one side. Look
for the TIN on the outboard side of
tires as mounted on the vehicle. If the
TIN is not found on the outboard side
then you will find it on the inboard
side of the tire.
EXAMPLE: DOT MA L9 ABCD
1504
The treadwear grade is a comparative rating
based on the wear rate of the tire when tested
under controlled conditions on a specified
government test course. For example, a tire
graded 150 would wear one and one-half
(1
1
/
2
) times as well on the government course
as a tire graded 100. The relative performance
of tires depends upon the actual conditions of
their use, however, and may depart signifi-
cantly from the norm due to variations in
driving habits, service practices and differ-
ences in road characteristics and climate.
The traction grades, from highest to lowest,
are AA, A, B and C. Those grades represent
the tire’s ability to stop on wet pavement as
measured under controlled conditions on
specified government test surfaces of asphalt
and concrete. A tire marked C may have poor
traction performance.
The temperature grades are A (the highest), B
and C, representing the tire’s resistance to the
generation of heat and its ability to dissipate
heat when tested under controlled conditions
on a specified indoor laboratory test wheel.
Sustained high temperature can cause the
material of the tire to degenerate and reduce
tire life, and excessive temperature can lead
to sudden tire failure. The grade C corre-
sponds to a level of performance which all
passenger car tires must meet under the Fed-
eral Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel than
the minimum required by law.
N00939300873
Proper tire inflation pressure is essential for
the safe and satisfactory operation of your
vehicle. The wrong tire pressure will cause
problems in three major areas:
Safety
DOT
Department of Transporta-
tion
This symbol certifies that
the tire is in compliance
with the U.S.
Department
of Transportation tire safety
standards, and is approved
for highway use.
MA
Code representing the tire
manufacturing location. (2
digits)
L9
ABCD
Code representing the tire
size. (2 digits)
Code used by tire manufac-
turer. (1 to 4 digits)
15
Number representing the
week in which the tire was
manufactured. (2 digits)
04
Number representing the
year in which the tire was
manufactured. (2 digits)
Treadwear, Traction and Temper-
ature Grades
Treadwear
Traction
Temperature
Tire inflation pressures
BK0220401US.book 13 ページ ２０１５年６月３日 水曜日 午前７時４２分
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