Mixing tires could cause you to
lose
control while
driving.
If
you mix tires
of
different sizes or types
(radial
and bias-belted tires), the vehicle may not
handle properly, and you could have
a
crash.
Using tires
of
different sizes may also cause
damage to
your
vehicle.
Be
sure to use the same
size and type tires
on
all
wheels.
It’s all right to drive with your compact spare
(if you have one). It was developed for
use
on
your vehicle.
Uniform Tire Quality Grading
The following information relates to the system
developed
by
the United States National Highway
Traffic Safety Administration, which grades tires by
treadwear. traction and temperature performance. (This
applies only to vehicles
sold
in
the United States.) The
grades are molded on the sidewalls of most passenger
car tires. The Uniform Tire Quality Grading system does
not apply to deep tread, winter-type snow tires,
space-saver or temporary use spare tires, tires with
nominal
rim
diameters
of
10
to
12
inches
(25
to
30
cm),
or
to some limited-production tires.
While the tires available on General Motors passenger
cars and light trucks may vary
with
respect to these
requirements and additional General Motors Tire
Performance Criteria (TPC) standards.
c
Urades, they rnust
also
conform to Federal safety
Treadwear
The treadwear grade is a comparative rating based
on
the wear rate
of
the tire when tested under controlled
conditions on
a
specified government test course. For
example.
a
tire graded 150 would wear one and
a
half
(
1
1/2)
times
as
well on the government course
as
a tire
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
clilnate.
e
oraded
100.
The relative performance of tires depends
6-45
To Next Page
Loading...
