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This two-digit number, known as the aspect ratio, gives the tire’s ratio of height to width. Numbers of 70 or lower
indicate a short sidewall for improved steering response and better overall handling on dry pavement.
R
The “R” stands for radial. Radial ply construction of tires has been the industry standard for the past 20 years.
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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.
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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 mean 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.
Treadwear Number UTQGS Information
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”.