Driving on any tire that does not have the correct inflation pressure is dangerous. Proper inflation pressure for your tires may be found in the vehicle owner’s manual or the vehicle’s tire information placard.
Any underinflated tire builds up excessive heat that may result in sudden tire destruction.
Refer to the tire placard on the vehicle (check vehicle and/or vehicle owners manual for placard location) for the recommended operating inflation pressures. These pressures must be maintained as a minimum. Do not exceed the maximum pressure indicated on the tire sidewall of passenger car tires.
If you are replacing the original size tires with tires of a different size, you must consult a knowledgeable tire dealer to determine the correct inflation pressure for your new tires.
Checking Tire Pressure
Check your tire inflation pressures, including the spare, at least once a month and before going on a long trip. Tire pressure should be measured when tires are cold – that is, they have not been driven on. Otherwise, your tires may have heated up, increasing the air pressure inside them by several pounds. This is normal. Never “bleed” or reduce the air pressure in a hot tire.
Failure to maintain correct inflation pressures may result in rapid wear and uneven tread wear, improper vehicle handling and excessive heat buildup which may result in tire failure. (Evidence of air loss or repeated underinflation requires tire removal and expert inspection.)
Tire Inflation with Nitrogen
One of the most important factors in tire care is maintaining proper inflation pressure, regardless of the inflation gas.
Nitrogen is a inert (non-flammable) gas – basically, nothing more than dry air with the oxygen removed (air contains about 78% nitrogen). Nitrogen inflation does not harm tires nor does it affect the warranty.
Proper tire inflation, whether nitrogen or normal air, helps tires wear longer, saves fuel, and helps prevent accidents. Underinflation, regardless of the inflation gas, can make it harder to steer and stop your vehicle, result in loss of vehicle control, cause sudden tire destruction, and lead to serious injury or death.
Nitrogen inflation will not prevent damage or loss of inflation due to road hazards. Nitrogen inflation will also not prevent tire damage due to underinflation, overloading, or off road service. Tire inflation should always be checked and adjusted to the proper inflation pressure on a regular basis (at least monthly and before long trips), regardless of the inflation gas, to provide optimum tire performance.
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Source: Cooper Tires