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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.
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.
UTQGS Information
Tread wear Number
This number indicates the tire's wear rate. The higher the tread wear 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".
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