Letter Rating; Speed Rating; Maximum Load Rating- Page 553

95

“95” is the Load Index. This two-or
three-digit number indicates how
much weight each tire can support.

H

“H” is the speed rating. The speed
rating denotes the maximum speed for
which the use of the tire is rated.

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 tires with a maximum speed
capability over 186 mph, tire manufacturers
always use the letters ZR.

M+S or M/S: Mud and Snow

AT: All Terrain.
AS: All Season. The “M+S” or “M/S”
indicates that the tire has some
functional use in mud and snow.

U.S. DOT Tire Identification Number
(TIN)

This begins with the letters “DOT”
which indicates 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 manufactured.
For example, the numbers 457 means
the 45st week of 1997. After 2000 the
numbers go to four digits. For
example, the number 2102 means the
21th week of 2002. 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 tire materials,
which include steel, nylon, polyester,
and other.

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.

Customer Information and Reporting Safety Defects

Tire Information (U.S.A.)

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