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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. The ratings range from 99 miles per hour (mph) to 186 mph. These ratings are listed
below. Note: You may not find this information on all tires because it is not required by law.
*For Tires with a maximum speed capability over 149 mph, tire manufacturers sometimes use the letters ZR.
For those with a maximum speed capability over 186 mph, tire manufacturers always use the letters ZR
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 discre-
tion. 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 rub-
ber-coated fabric in the tire. In general, the greater the number of plies, the more weight a tire can sup-
port. 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
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”.
Summary of Contents for RB4000
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