Wheels
maximum permissible road
speeds . See also ¢
A in General
information on page 330 .
Tire pressure monitoring
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 co ntact with the road.
Tread separat ion
means pulling away of t he t read
from the tire carcass.
Treadwear indicators (TWI)
means the projections within the
pr incipal grooves designed to give
a visual indication of the degrees
of wear of the tread . See
¢ page 339, Treadwear indicator
for more information on measu r-
ing tire wear.
Uniform Tire Quality Grading
is a tire information system devel -
oped by the United States Nat ion-
al Highway Traffic Safety Admin-
istration (NHTSA) tha t is designed
to he lp buyers make relative com-
33 6
parisons among tires . The UTQG
is not a safety rat ing and not a
guarantee that a t ire will last for
a prescribed number of miles
(kilo m et ers) or perform in acer -
t ain way . It simply g ives tire buy -
ers add iti ona l information to
combine with other considera -
tions , such as price, brand loyalty
and dealer recommendations. Un-
de r UTQG, tires are graded by the
tire manufacturers in three areas:
treadwear, tract ion, and tempera -
ture res istance. The UTQG info r-
mation on the tires , molded into
the sidewalls .
U.S. DOT Tire Identification
Number (TIN)
This is the tire's "serial number".
It beg ins with the letters "DOT"
and indicates that the tire meets
all federal st andards. The next
two numbers or let ters indicate
the plant whe re it was ma nufac -
tured, and t he last four num bers
represent t he week and year of
manufacture. For example,
DOT ... 2217 ...
means that the tire was produced
in the 22nd week of 2017. The
other numbers are ma rketing co-
des that may or may not be used
~
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