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7-22
Vehicle care and maintenance
7
Maximum Pressure
Maximum Pressure indicates the maximum permissible
cold tire inflation pressure for this tire.
Tire Identification Number (TIN)
The TIN may be found on one or both sides of the tire but
the date 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
Treadwear, Traction and Temperature Grades
Treadwear
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 perfor-
mance of tires depends upon the actual conditions of their use,
however, and may depart significantly from the norm due to
variations in driving habits, service practices and differences in
road characteristics and climate.
Traction
The traction grades, from highest to lowest, are AA, A, B and
C. Those grades represent the tire’s ability to stop on wet pave-
ment as measured under controlled conditions on specified
government test surfaces of asphalt and concrete. A tire
marked C may have poor traction performance.
Temperature
The temperature grades are A (the highest), B and C, represent-
ing 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 tempera-
ture can cause the material of the tire to degenerate and reduce
tire life, and excessive temperature can lead to sudden tire fail-
ure. The grade C corresponds to a level of performance which
all passenger car tires must meet under the Federal Motor Vehi-
cle Safety Standard No. 109. Grades B and A represent higher
levels of performance on the laboratory test wheel than the
minimum required by law.
DOT
Department of Transportation
This symbol certifies that the tire is in compli-
ance with the U.S. Department of Transporta-
tion 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 manufacturer. (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)
BK0139500US.book 22 ページ ２０１１年４月１９日 火曜日 午後１時４８分
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