replacement
115
aintain good handling and vehicle depart significantly from the norm due
nse, use only tires of a single to variations in driving habits, service
configuration from a single manu- practices and differences in road char-
er.
acteristics and climate.
ly with the specified tire inflation
ures – and be sure to have the
and tire assembly balanced
Traction
The traction grades, from highest to
lowest, are AA, A, B and C.
time you change a tire or wheel.
Those grades represent the tire's ability
to stop on wet pavement as measured
under controlled conditions on speci-
fied government test surfaces of
asphalt and concrete. A tire marked C
may have poor traction performance.
quality grades
wear
on AA A B C
erature A B C
All passenger car tires must con-
orm to Federal Safety Require-
s in addition to these grades.<
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests, and does
not include acceleration, cornering,
hydroplaning, or peak traction charac-
teristics.<
dwear
eadwear grade is a comparative
based on the wear rate of the tire
tested under controlled condi-
on a specified government test
e.
Temperature
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 condi-
tions on a specified indoor laboratory
test wheel.
xample, a tire graded 150 would
1
one and one-half – 1 /2 – times as
n the government course as a tire
d 100. The relative performance
s depends upon the actual condi-
of their use, however, and may
English 
