101
MAINTENANCE
LETTER RATING
SPEED RATING
Q
99 MPH
R
106 MPH
S
112 MPH
T
118 MPH
U
124 MPH
H
130 MPH
V
149 MPH
W
168* MPH
Y
186* MPH
* For tires with a maximum speed capability over 149 mph, tire manufacturers sometimes
use the letters ZR.
For those with a maximum speed capability over 186 mph, tire manufacturers always use
the letters ZR.
U.S. DOT TIRE IDENTIFICATION NUMBER:
This begins with the letters “DOT” and
indicates that the tire meets all federal standards. The next two numbers or letters are
the plant code where it was manufactured, and the last four numbers represent the
week and year the tire was built. For example, the numbers 3197 means the 31st week of
1997. The other numbers are marketing codes used at the manufacturer’s discretion. This
information is used to contact consumers if a tire defect requires a recall.
TIRE PLY COMPOSITION AND MATERIALS USED:
The number of plies indicates the
number of layers of rubber-coated fabric in the tire. In general, the greater the number
of plies, the more weight a tire can support. Tire manufacturers also must indicate the
materials in the tire, which include steel, nylon, polyester, and others.
MAXIMUM LOAD RATING:
This number indicates the maximum load in kilograms and
pounds that can be carried by the tire.
MAXIMUM PERMISSIBLE INFLATION PRESSURE:
This number is the greatest amount of
air pressure that should ever be put in the tire under normal driving conditions.
1.5.9.2. UTQGS INFORMATION
TREAD WEAR NUMBER:
This number indicates the tire’s wear rate. The higher the tread
wear number is, the longer it should take for the tread to wear down. For example, a tire
graded 400 should last twice as long as a tire graded 200.
TRACTION LETTER:
This letter indicates a tire’s ability to stop on wet pavement. A higher
graded tire should allow you to stop your car on wet roads in a shorter distance than a tire
with a lower grade. Traction is graded from highest to lowest as “AA”,”A”, “B”, and “C”.
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