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9
CHECK THE COLD INFLATION PRESSURES IN ALL YOUR
TIRES, INCLUDING THE SPARE, AT LEAST ONCE EACH
MONTH
Failure to maintain correct inflation pressure may result in
improper vehicle handling and may cause rapid and irregular
tire wear, sudden tire destruction, loss of vehicle control and
serious personal injury. Therefore, inflation pressures should
be checked at least once each month and always prior to long
distance trips. This applies to all tires, including sealant types
and self-supporting tires which are as susceptible to losing air
pressure as any other type if not properly maintained.
Pressures should be checked when tires are cold; in other
words, before they have been driven on. Driving, even for a
short distance, causes tires to heat up and air pressure to
increase.
CHECKING PRESSURES WHEN TIRES ARE HOT
If inflation pressures are checked after tires have been driven for
more than three minutes or more than one mile, the tires become
hot and the inflation pressures will increase by approximately 4
psi. Therefore when the tire pressure is adjusted under these
conditions, it should be increased to a gauge reading of 4 psi
greater than the recommended cold inflation pressure.
For Example Only:
Recommended cold inflation: 30 psi
Gauge reading of hot tire was found to be: 32 psi
(Actual pressure is 28 psi)
Therefore to achieve the 30 psi recommended pressure,
Inflate to 34 psi (add 2 psi)
Check the cold pressure as soon as possible, preferably
within 24 hours. “Bleeding” air from hot tires could
result in underinflation. Use an accurate tire pressure
gauge to check pressures. Never allow children to inflate
or deflate tires.