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Ti res and wheels
wheel size, you will have to pur-
chase new tires to match the new
rim diameter .
Rim size designat ion
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 (letter code)
means the speed at which 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)
c::;,
page
189.
You may not find
this information on all tires be-
cause it is not required by law.
The speed rat ing letter code,
where applicable, is mo lded on
the tire sidewall and indicates t he
maximum permissible road
speeds
c::;,
.&
in Winter tires on
page
194 .
Tire pressure monitoring
system
means a system that detects
when one or more of a vehicle's
1 7 4
tires are underinflated and ill umi-
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 t read. See
c::;,
page 185 , Tread Wear Indica-
tor (TWI) for more information
on measuring tire wear.
Uniform Tire Quality Grading
is a tire information system devel-
oped by the United States Nation-
al Highway Traffic Safety Adminis-
tration (NHTSA) that is designed
to help buyers make relative com-
parisons among tires . The UTQG is
not a safety rating and not a guar-
antee tha t a tire will last for a
prescr ibed number of mi les or
perform in a certain way. It sim-
ply gives tire buyers addit ional in-
formation to combine w ith other
considerat ions, such as pr ice,
...
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