1993 Chevrolet Corvette Owner's Manual - Page 286
1993 Chevrolet Corvette Manual
Page 286 highlights
Unijiim Tire Quality Grading The following information relatesto the system developed the United States by National Highway Tr&c Safety Administration which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in the United States.) Treadwear The treadwear gradeis a comparative rating based on the wear rate of the tire wh
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L
Unijiim
Tire
Quality
Grading
The
following
information
relates
to
the
system
developed by the United
States
National
Highway
Tr&c
Safety
Administration
which
grades
tires
by
treadwear, traction and temperature
performance.
(This
applies
only
to
vehicles
sold
in
the
United States.)
Treadwear
The
treadwear
grade
is
a
comparative
rating
based
on
the
wear
rate
of
the tire
wh<n tested under
mntmlled
conditions
on
a
specified
government
test
course.
For
example,
a
tire
graded
150
would
wear one
and
a
half
(1%)
times
as
well
on
the
govement course as
a
tire
graded
100.
Therelative 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.