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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 measure-
ment of how much weight each tire can support. You may nd this infor-
mation in your owner’s manual. If not, contact a local tire dealer. Note:
You may not nd 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 nd this information on all tires because it is not required by law.
Tire Safety Information
* For tires with a maximum speed capability over 149 mph, tire manufac-
turers sometimes use the letters ZR. For those with a maximum speed
capability over 186 mph, tire manufacturers always use the letters ZR.
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