Audi A7 2023 Owner's Manual page 263

Wheels
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates the
maximum permissible road
speeds. See also > A in General
information on page 255.
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 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 264, 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-
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 that a tire will last for a
prescribed number of miles (kilo-
meters) or perform ina certain
way. It simply gives tire buyers ad-
ditional information to combine
with other considerations, such as
price, brand loyalty and dealer
recommendations. Under UTQG,
tires are graded by the tire manu-
facturers in three areas: tread-
wear, traction, and temperature
resistance. The UTQG information
on the tires, molded into the side-
walls.
U.S. DOT Tire Identification
Number (TIN)
This is the tire's "serial number".
It begins with the letters "DOT"
and indicates that the tire meets
all federal standards. The next
two numbers or letters indicate
the plant where it was manufac-
tured, and the last four numbers
represent the week and year of
manufacture. For example,
DOT... 2222...
261