M
N
0
...J
'SI:
,....,
\!)
1.1'1
,....,
1.1'1
,....,
run flat tires. If run flat tire s
are used , they must be in-
stalled on all four wheels.
Mixing tire types is not per-
mitted.
(D Note
-For technical reasons, it is
not generally possible to
use the wheel rims from
other vehicles. This can hold
true for wheels of the same
vehicle type.
- If the spare tire is different
from the tires that you have
mounted on your vehicle
(for example winter tires or
wide profile tires), then use
the spare tire for a short pe-
riod of time only and drive
with extra care. Replace the
flat t ire with the tire match-
ing the others on your vehi-
cle as soon as possible.
- Never drive without the
valve stem cap. The valves
could get damaged .
@) For the sake of the environment
Dispose of old tires in accord-
ance with the local require-
ments.
Tires and wheels
Uniform tire quality grading
- Tread wear
- Traction AA A B C
- Temperature AB C
Quality grades can be foun d where applicab le
on the t ire side wall between t read shoulder
and maximum section width
c> page 291,
fig. 254 .
For example: Tread wear 200 , Traction AA,
Temperat ure A.
All passenger car tir es must conf orm to Feder-
al Safety Requirements in addition to these
grades.
Tread wear
The tread wear grade is a comp arati ve rati ng
based on the wear rat e of t he ti re when t est ed
under cont roll ed conditions on a specifie d
government test course .
For example , a tire graded 1S0 wo uld wear
one and one half (1 1/ 2) t imes as well on t he
governmen t course as a ti re graded 100 .
The relative perfo rmance of t ires depends
upon the actu al condition s of t heir use, how -
ever, and may depart significantly from t he
norm due t o variat ions in dr iving habits, serv-
ice practices and differences in road character-
istics and climate.
Traction
The traction grades, from hig hest t o lowest ,
are AA, A, B and
C. Those grades represent the
ti re's ability to stop on wet pavement as
measured under cont rolled conditions on
specified government test surfaces of asphalt
and concrete. A t ire mar ked C may have poor
traction performance
c> ,&..
Temperature
The temperature gr ades are A (the highest),
B, and C, represent ing the tire's resistance to
the generation of heat and its abili ty to dissi-
pate heat when tested under controlled condi-
tions on a specif ied indoo r labo rato ry test
whee l.
297
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