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P
The “P” indicates the tire is for passenger vehicles.
next number
This three-digit number gives the width in millimeters of the tire from sidewall edge
tosidewall edge. in general, the larger the number, the wider the tire.
next number
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.
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
radialtires 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.
Letter rating
Speed rating
Q
99 mph
r
106 mph
S
112 mph
T
118 mph
U
124 mph
H
130 mph
V
149 mph
W
168* mph
Y
186* mph
* 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.
