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Wheels and tires – FORD 2015 F-550 v.1 User Manual

Page 271

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A. P: Indicates a tire, designated

by the Tire and Rim Association,

that may be used for service on

cars, sport utility vehicles,

minivans and light trucks. Note: If
your tire size does not begin with
a letter this may mean it is
designated by either the European
Tire and Rim Technical
Organization or the Japan Tire
Manufacturing Association.

B. 215: Indicates the nominal
width of the tire in millimeters
from sidewall edge to sidewall
edge. In general, the larger the

number, the wider the tire.
C. 65: Indicates the aspect ratio

which gives the tire's ratio of
height to width.
D. R: Indicates a radial type tire.
E. 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.
F. 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 manual. 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.

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.

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

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