Ford Transit (2018 year). Manual — part 66

15: Indicates the wheel or
rim diameter in inches. If
you change the wheel
size, you will have to
purchase new tires to
match the new wheel
diameter.

E

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 the Owner’s
Guide. If not, contact a
local tire dealer.

F

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

G

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 kph) to 186 mph
(299 kph). These ratings
are listed in the following
chart.

United States of
America DOT Tire
Identification Number
(TIN): This begins with
the letters DOT and
indicates that the tire

H

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.
M+S or M/S: Mud and

Snow, AT: All Terrain, AS:
All Season.

I

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

J

sidewall. Tire

manufacturers also must
indicate the ply materials
in the tire and the
sidewall, which include
steel, nylon, polyester,
and others.
Maximum Load:
Indicates the maximum
load in kilograms and
pounds that can be
carried by the tire. Refer to
the Safety Compliance

K

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
seating position), for the
correct tire pressure for
your vehicle.
Treadwear, Traction
and Temperature
Grades:Treadwear The

treadwear grade is a
comparative rating based
on the wear rate of the tire

L

when tested under
controlled conditions on
a specified government
test course. For example,
a tire graded 150 would
wear one and one-half
times as well on the
government course as a
tire graded 100. Traction:
The traction grades, from
highest to lowest are AA,
A, B, and C. The grades
represent the tire's ability
to stop on wet pavement

as measured under
controlled conditions on
specified government test
surfaces of asphalt and
concrete. A tire marked C
may have poor traction
performance.
Temperature: The
temperature grades are A
(the highest), B and C,
representing the tire's
resistance to the
generation of heat and its
ability to dissipate heat
when tested under
controlled conditions on
a specified indoor
laboratory test wheel.
Maximum Inflation
Pressure: Indicates the
tire manufacturer's
maximum permissible
pressure or the pressure
at which the maximum

M

load can be carried by the
tire. This pressure is
normally higher than the
manufacturer's
recommended cold
inflation pressure, which
can be found on 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
seating position), or Tire
Label which is located on
the B-Pillar or the edge of

the driver door. The cold
inflation pressure should
never be set lower than
the recommended
pressure on the vehicle
label.

Tire speed ratings

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

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.

Note: If the tire size does not begin
with a letter, this may mean it is
designated by either ETRTO
(European Tire and Rim Technical
Organization) or JATMA (Japan Tire
Manufacturing Association). You
may not find this information on all
tires because it is not required by
federal law.

Note: The tire suppliers may have
additional markings, notes or
warnings, for example standard
load, radial tubeless, etc.

T Type Tires

T145/80D16 is an example of a
tire size. T type tires have some
additional information beyond
those of P type tires. The
definitions of these items are
listed below.

Note: The temporary tire size for
your vehicle may be different from
this example. Tire Quality Grades
do not apply to this type of tire.

A

B

C

D

E

E142545

T: Indicates a type of tire,
designated by the Tire
and Rim Association, that
is intended for temporary
service on cars,
sport-utility vehicles,
minivans and light trucks.

A

145: 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.

B

80: Indicates the aspect
ratio which gives the tire's
ratio of height to width.
Numbers of 70 or lower
indicate a short sidewall.

C

D: Indicates a diagonal
type tire. R: Indicates a
radial type tire.

D

16: Indicates the wheel or
rim diameter in inches. If
you change the wheel
size, you will have to
purchase new tires to
match the new wheel
diameter.

E

Additional Information for LT
Type Tires

LT235/85 R16 is an example of a
tire size. LT type tires have some
additional information beyond
those of P type tires. The
definitions of these items are
listed below.

Note: Tire Quality Grades do not
apply to this type of tire.