Mixing tires could cause
you
to lose control while
driving.
If
you
mix tires of dif€erent
sizes
or
types
(radi,al
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,
though. It was developed for use
0n
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 lirnited-pro'duction tires.
While the tires available
on
General Motors passenger
cars and light trucks may vary with respect to these
grades, they must also conform to Federal safety
requirements and additional General Motors Tire
performance Criteria
(TPC)
standards.
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 gov'esnrnent course as a tire
graded
100.
The relative performance
of
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.
6-54
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