Treadwear .
The
treat1w8ar
!J"ada
is
8
~ative
rating
based
on
the
W8at
rate of the tire
when testecf'
undef
oontrolled conditions 00 a specified
government
test
COIXse.
For
exafl1)le. the lire. {J"aded 150
WOIAd
w.ear one
anCl
a
haW
(1-1 / 2)
times
,
as
we.
00
the government. course
as
a tire
graded
100. The
relative
performance
oJ
·t
ires
depends
upon
the actual conditions
of
their
use,
however,
and
may depart significantly
from
the 'norm due
to
.
variati
ons
In
driving habits,
service practices and differences in road characteristics and climate. "
Traction - A,
~
,
C
The traction
gradeS
,
from
highest to
lOWest
are:
A,
B. and C.
They
represent
the tire's ab!fity
to
stop
on
wet
pavement
as
measured
meier
cootrol!ed
conditions 00 specified
government
· test
SlM'faces
of asphall and concrete. A
tire marked C may have
poor
t
raction
performance
.
Warning: The
traction
'g
ra
de
assigned.to this tire is based on braking (straight-
ahead) tractlon·tests and'
dOes
no
t
inc
l
LJd:e
cornaring
(turning) traction.
Temperature
'
~
'
A.
B" C
-
The temperature
gades
are A· (the highest), e,
and
C,
representing the tire's
resistance
to
the
generation
of heat and its ability
to
"dssipale heat when tesled
lKlder
contrOlled
QOOdilions
00 a .
specified.
, indoor Iabofalory test
~
"
SUstalrlGd
hVl
·tef1l)er"8Iure ·
cancause
the mat.erial
of
the tire
to
c;tegenefate
.
and
reduc
'e
tire
life,
arid
e)(08SSlve
tei11>erature
can
,
tQad
to
suQden
tire
failUre.
The
grade C
COfrespo~
to
' a leval
of
peiformance
which
all
passenger car
tires must
~
·
uilder',the
Federal'MOtor
VetJicie
saety
, 'Standard No. 109.
Grades'B and A rfiP'esent higher
~~
of performance
00
the laboratory test
wheel than the
minimum
reQiMed
by
laW.
warni
ng
:
The
tefTllElfatu'e
grade lor this tire
Is
established
lor a tire that is
properly
i~
'
Mel
net
ov~
"
Excessive
Speed, I.nderinftation,
or
ex~sive
IQ<icing
. either separatety or.in combination,
c
,
~
C8lJSe heat buildlJJ
and possible tire failure. .
TbMe
' grades are molded on
the
sidewall
t: ,
of
paseenger car tires.
WhUethe
tires
available
as
standilrd
"
or
optlonal
.• pment
on
General
Moton
vebiclM
may very
With
respect
to.
thew
gradeS,
..
such tires
meet
General
Motors
petfOf'mance
standM'ds
and
have
been
approi8d
tor
ld8
on
General
Motor
s vehicles. All
passenger
car tires must conform
to
Federal safety requirements
in
addition
to
these grades.
You should replace
your
lites
when
:
1.
The
tires are worn to a point where 1.6 'mlllimeiers
(2/32
Inch)
or
less
tread remains,
or
the cord
Or
fabric is showing. '
To help you detect this,
'JWI
tir~
have
built-in tread wear indicators that
appear between the tread grooves When the tread is 1.6 nillimeters
(2
/
32
inch)
or
less. When the Indicators appear In
two
or
lTlOfe
~
!J"CIOVeS
at
three
spots
around
the tire, the tire
shouk::l
be replaced.
2. The
tread
or
sidewall
is
crack
ed
. cui
or
snagged
deep
enough
to
expOse
the cord
or
Jabric.
3.
The tire has a bu
mp,
.bulge
Of
spli
t.
4. The tire has a puncture.
cu
t. or other injury that can',t
be-
correclty repalred
because
of the size
or
location
of
the
injury
.
5-20
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