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a,
a,
-
N
r--
N
-
0
0
0:
a:,
Rim
means a metal support for a tire
or a tire and tube assembly upon
which the tire beads are seated.
Rim diamet er
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur-
chase new tires to match the new
rim diameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance between
rim flanges.
Sidewall
means that portion of a tire be-
tween the tread and bead.
Speed rating (l etter code)
means the speed at wh ich a tire is
designed to be driven for extend-
ed periods of time . The ratings
range from 93 mph (150 km/h)
to 186 mph (298 km/h)
¢
table
on page 231.
You may not find
this information on all tires be-
cause it is not required by law.
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates the
Wheels
maximum permissible road
speeds
¢
A
in Winter tires on
page 245.
Tire pressure mon itoring
system*
means a system that detects
when one or more of a vehicle's
tires are underinflated
and illumi-
nates a low tire pressure warning
telltale.
Tread
means that portion of a tire that
comes into contact with the road .
Tread separation
means pulling away of the tread
from the tire carcass.
Treadwear indicators (TWI )
means the projections within the
principal grooves designed to give
a visual indication of the degrees
of wear of the tread. See
¢
page 239, Treadwear indicator
for more information on measur-
ing tire wear .
Uniform Tire Quality Grading
is a tire information system devel-
oped by the United States Nation-
a l Highway Traffic Safety Admin-
istration (NHTSA) that is designed
to help buyers make relative
235
..
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