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1.6.9.1. Information on Passenger Vehicle Tires
Please refer to the diagram below.
P
The "P" indicates the tire is for passenger vehicles.
(Trailer tires will carry the "ST" indication, for Special Trailer service.)
Next number
This three-digit number gives the width in millimeters of the tire from sidewall edge to sidewall
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 radial tires
have these markings; hence, they have some mud and snow capability.
