Treadwear; Temperature - Chevrolet El Camino 1983 Owner's Manual

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 ·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 - 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 traction performance.
Warning:
The
traction
'grade assigned .to
this tire is
based
on
braking
(straight-
ahead)
tractlon·tests
and'dOes not inclLJd: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. e rial 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, ' S tandard No. 109.
Grades'B
and
A rfiP'esent
higher
~~
of
performance 00 the laboratory test
wheel than
the minimum reQiMed
by
laW.
warning:
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 sidewallt:
, o f
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
Motors
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
cracked.
cui or snagged deep enough to expOse
the cord or Jabric.
3. The
tire
has
a
bump, .bulge
Of
split.
4. The tire has a puncture. cut. or
other
injury
that
can',t be- correclty
repalred
because of the size
or
location of the injury.
5-20