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Note: You may not find this information on all tires because it is not
required by federal law.
Letter rating Speed rating - km/h (mph)
Q 159 km/h (99 mph)
R 171 km/h (106 mph)
S 180 km/h (112 mph)
T 190 km/h (118 mph)
U 200 km/h (124 mph)
H 210 km/h (130 mph)
V 240 km/h (149 mph)
W 270 km/h (168 mph)
Y 299 km/h (186 mph)
Note: For tires with a maximum speed capability over 240 km/h
(149 mph), tire manufacturers sometimes use the letters ZR. For those
with a maximum speed capability over 299 km/h (186 mph), tire
manufacturers always use the letters ZR.
8. M+S or M/S: Mud and Snow. or
AT: All Terrain. or
AS: All Season.
9. U.S. DOT Tire Identification Number (TIN): 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, the next two are the tire size code and the last four
numbers represent the week and year the tire was built. For example,
the numbers 317 mean the 31st week of 1997. After 2000 the numbers
go to four digits. For example, 2501 means the 25th week of 2001. The
numbers in between are marketing codes used at the manufacturer’s
discretion. This information is used to contact customers if a tire defect
requires a recall.
10. Tire Ply Composition and Material Used: Indicates the number of
plies indicates or the number of layers of rubber-coated fabric in the tire
tread and sidewall. Tire manufacturers also must indicate the ply
materials in the tire and the sidewall, which include steel, nylon,
polyester, and others.
11. Maximum Load: Indicates the maximum load in kilograms and
pounds that can be carried by the tire. Refer to the tire label or the
safety certification label, located on the B-Pillar or the driver’s door, for
the correct tire pressure for your vehicle
2004 Town Car (tow)
Owners Guide (post-2002-fmt)
USA English (fus)
Maintenance and Specifications
261
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