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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 specif ied 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 f ailure. The
grade C corresponds to a level of
perf ormance, which all passenger
vehicle tires must meet under the
Federal Motor Vehicle Saf ety
Standard No. 109. Grades B and A
represent higher levels of
perf ormance on the laboratory test
wheel than the minimum required by
law. Warning: The temperature grade f or
this tire is established f or a tire that
is properly inf lated and not over-
loaded. Excessive speed, underinf la-
tion, or excessive loading, either
separately or in combination, can
cause heat buildup and possible tire
f ailure.
The tires that came on your vehicle
have a number of markings. Those
you should be aware of are described
below.
Whenever tires are replaced, they
should be replaced with tires of the
same size. Following is an example
of tire size with an explanation of
what each component means.
Speed symbol (an
alphabetical code indicating
the maximum speed rating). Tire construction code (R
indicates radial). Load index (a numerical code
associated with the maximum
load the tire can carry). Rim diameter in inches.
Aspect ratio (the tire’s section
height as a percentage of its
width). Tire width in millimeters. Vehicletype(Pindicates
passenger vehicle).
P
225
55
16
94
V R
Temperature A,B,C
Tire Labeling
DOT T ire Quality Grading (U.S. Vehicles), T ire L abeling
Tire Size
T echnical Inf ormation
249
P225/55R16 94V
