Ford 2009 F-150 Owner's Manual page 230

Tires, Wheels and Loading
5. 15: Indicates the wheel or rim diameter in inches. If you change your
wheel size, you will have to purchase new tires to match the new wheel
diameter.
6. 95: Indicates the tire's load index. It is an index that relates to how
much weight a tire can carry. You may find this information in your
Owner's Guide. If not, contact a local tire dealer.
Note: You may not find this information on all tires because it is not
required by federal law.
7. 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.
8. 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
230
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)
Speed rating - mph (km/h)
81 mph (130 km/h)
87 mph (140 km/h)
99 mph (159 km/h)
106 mph (171 km/h)
112 mph (180 km/h)
118 mph (190 km/h)
124 mph (200 km/h)
130 mph (210 km/h)
149 mph (240 km/h)
168 mph (270 km/h)
186 mph (299 km/h)