Tiffin Motorhomes 2014 Allegro Owner's Manual page 102

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TIFFIN MOTORHOMES –ALLEGRO® Chapter 13 ROUTINE MAINTENANCE
Information on Passenger Vehicle Tires
Please refer to the diagram below.
P—The "P" indicates the tire is for passenger vehicles. NOTE: Passenger car tires are not recommended for use on
trailers, because the capacity ratings are not marked on the side walls of these tires. In the event a passenger car tire is
used, the capacity must be de-rated by 10%.
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 number.
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.
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