Ford 2013 Flex Owner's Manual page 342

G. H: Indicates the tire's speed rating. The speed rating denotes the
speed at which a tire is designed to be driven for extended periods of
time under a standard condition of load and inflation pressure. The tires
on your vehicle may operate at different conditions for load and inflation
pressure. These speed ratings may need to be adjusted for the difference
in conditions. The ratings range from 81 mph (130 km/h) to 186 mph
(299 km/h). These ratings are listed in the following chart.
Note: You may not find this information on all tires because it is not
required by federal law.
Letter rating
M
N
Q
R
S
T
U
H
V
W
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.
2013 Flex (471)
Owners Guide gf, 4th Printing, December 2012
USA (fus)
Wheels and Tires
Speed rating - mph (km/h)
341
81 (130)
87 (140)
99 (159)
106 (171)
112 (180)
118 (190)
124 (200)
130 (210)
149 (240)
168 (270)
186 (299 )