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Speed rating - mph
(km/h)
Letter
rating
168 mph (270 km/h)W
186 mph (299 km/h)Y
Note: For tires with a maximum speed
capability over 149 mph (240 km/h),
tire manufacturers sometimes use the
letters ZR. For those with a maximum
speed capability over 186 mph (299
km/h), tire manufacturers always use
the letters ZR.
H. 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 designating 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 identification codes
used for traceability. This information
is used to contact customers if a tire
defect requires a recall.
I. M+S or M/S: Mud and Snow, or
AT: All Terrain, or
AS: All Season.
J. Tire Ply Composition and
Material Used: Indicates the number
of plies 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.
K. Maximum Load: Indicates the
maximum load in kilograms and
pounds that can be carried by the tire.
Refer to the Safety Compliance
Certification Label (affixed to either
the door hinge pillar, door-latch post,
or the door edge that meets the
door-latch post, next to the driver's
seating position), for the correct tire
pressure for your vehicle.
L. Treadwear, Traction and
Temperature Grades:
319
Wheels and Tires
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