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Note: You may not find this
information on all tires because it is
not required by federal law.
mph ( km/h)Letter
rating
81 mph (130 km/h)M
87 mph (140 km/h)N
99 mph (159 km/h)Q
106 mph (171 km/h)R
112 mph (180 km/h)S
118 mph (190 km/h)T
124 mph (200 km/h)U
130 mph (210 km/h)H
149 mph (240 km/h)V
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: 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.
268
MKS (), enUSA
Wheels and Tires
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