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Tire Safety Information
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. Therefore, 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.
Safety First - Basic Tire Maintenance
Finding your Vehicle’s Recommented Tire
Pressure and Load Limits
Tire information placards and vehicle certification labels contain
information on tires and load limits. These labels indicate the vehicle
manufacturer’s information including:
• Recommended tire size
• Recommended tire inflation pressure
• Vehicle capacity weight (VCW-the maximum occupant and cargo
weight a vehicle is designed to carry)
• Front and rear gross axle weight ratings (GAWR- the maximum
weight the axle systems are designed to carry).
Both placards and certification labels are permanently attached to the
trailer near the left front.
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 kilopascals (kpa), which is the metric measure used
internationally.)
Manufacturers of passenger vehicles and light trucks determine this
number based on the vehicle’s design load limit, that is, the greatest
amount of weight a vehicle can safely carry and the vehicle’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.)
Because tires are designed to be used on more than one type of vehicle,
tire manufacturers list the “maximum permissible inflation pressure” on
the tire sidewall. This number is the greatest amount of air pressure that
should ever be put in the tire under normal driving conditions.
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