Section 2 – Tire Safety Information
R4 3/30/2017
Page 19
R
The "R" stands for radial. Radial ply construction of
tires has been the industry standard for the past 20
years.
Next number
This two-digit number is 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.
Next number
This two- or three-digit number is the tire's load
index. It is a measurement of how much weight
each tire can support. 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
law.
M+S
The "M+S" or "M/S" indicates that the tire has
some mud and snow capability. Most radial tires
have these markings; hence, they have some mud
and snow capability.
Speed Rating
The speed rating denotes the speed at which a tire is
designed to be driven for extended periods of time.
Note: You may not find this information on all tires
because it is not required by law.
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 where it
was manufactured, and the last four numbers
represent the week and year the tire was built. For
example, the numbers 3197 means the 31st week of
1997. The other numbers are marketing codes used
at the manufacturer's discretion. This information is
used to contact consumers if a tire defect requires a
recall.
Tire Ply Composition and Materials Used
The number of plies indicates the number of layers
of rubber-coated fabric in the tire. In general, the
greater the number of plies, the more weight a tire
can support. Tire manufacturers also must indicate
the materials in the tire, which include steel, nylon,
polyester, and others.
Maximum Load Rating
This number indicates the maximum load in
kilograms and pounds that can be carried by the
tire.
Maximum Permissible Inflation Pressure
This number is the greatest amount of air pressure
that should ever be put in the tire under normal
driving conditions.
2.5.10.b UTQGS Information
Treadwear Number
This number indicates the tire's wear rate. The
higher the treadwear number is, the longer it should
take for the tread to wear down. For example, a tire
graded 400 should last twice as long as a tire graded
200.
Traction letter
This letter indicates a tire's ability to stop on wet
pavement. A higher graded tire should allow you to
stop your car on wet roads in a shorter distance than
a tire with a lower grade. Traction is graded from
highest to lowest as "AA","A", "B", and "C".
Temperature Letter
This letter indicates a tire's resistance to heat. The
temperature grade is for a tire that is inflated
properly and not overloaded. Excessive speed,
underinflation or excessive loading, either
separately or in combination, can cause heat build-
up and possible tire failure. From highest to lowest,
a tire's resistance to heat is graded as "A", "B", or
"C".
2.5.10.c Information on Light Truck (LT) Tires
Please refer to the following diagram.
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