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Page 14
Safety
Tire Safety
Studies of tire safety show that maintaining proper
tire pressure, observing tire and vehicle load lim-
its (not carrying more weight in your vehicle than
your tires or vehicle can safely handle), avoiding
road hazards, and inspecting tires for cuts, slashes,
and other irregularities are the most important
things you can do to avoid tire failure, such as
tread separation or blowout and flat tires. These
actions, along with other care and maintenance
activities, can also:
• Improve vehicle handling
• Help protect you and others from avoidable
breakdowns and accidents
• Improve fuel economy
• Increase the life of your tires.
This booklet presents a comprehensive overview
of tire safety, including information on the follow-
ing topics:
• Basic tire maintenance
• Uniform Tire Quality Grading System
• Fundamental characteristics of tires
• Tire safety tips.
BASIC TIRE MAINTENANCE
Properly maintained tires improve the steering,
stopping, traction, and load-carrying capability of
your vehicle. Underinflated tires and overloaded
vehicles are a major cause of tire failure. There-
fore, as mentioned above, to avoid flat tires and
other types of tire failure, you should maintain
proper tire pressure, observe tire and vehicle load
limits, avoid road hazards, and regularly inspect
your tires.
- - - - - - - - - - - - - - NOTE- - - - - - - - - - - - - -
Use the following information to make tire safety a regular part of your vehicle maintenance
routine. Recognize that the time you spend is minimal compared with the inconvenience and
safety consequences of a flat tire or other tire failure.
UNDERSTANDING TIRE PRESSURE
AND LOAD LIMITS
Tire inflation pressure is the level of air in the tire
that provides it with load-carrying capacity and
affects the overall performance of the vehicle. The
tire inflation pressure is a number that indicates
the amount of air pressure– measured in pounds
per square inch (psi)–a tire requires to be properly
inflated. (You will also find this number on the
vehicle information placard expressed in kilo-
pascals (kPa), which is the metric measure used
internationally.)
Manufacturers of passenger vehicles and light
trucks determine this number based on the vehi-
cle’s design load limit, that is, the greatest amount
of weight a vehicle can safely carry and the ve-
hicle’s tire size.The proper tire pressure for your
vehicle is referred to as the “recommended cold
inflation pressure.” (As you will read below, it is
difficult to obtain the recommended tire pressure
if your tires are not cold.)
WARNING
Lug nuts must be re-torqued to 80 ft/lbs after
first 100 miles.