Honda 2003 Odyssey Owner's Manual page 327

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Tires
Use a gauge to measure the air
pressure at least once a month. Even
tires that are in good condition may
lose one to two psi (10 to 20 kPa, 0.1
to 0.2 kgf/cm ) per month.
Remember to check the spare tire at
the same time you check all the
other tires.
Check the pressure in the tires when
they are cold. This means the vehicle
has been parked for at least three
hours. If you have to drive the
vehicle before checking the tire
pressure, the tires can still be
considered ''cold'' if you drive less
than 1 mile (1.6 km).
324
Maintenance
If you check the pressure when the
tires are hot (the vehicle has been
driven several miles), you will see
readings 4 to 6 psi (30 to 40 kPa, 0.3
to 0.4 kgf/cm ) higher than the cold
reading. This is normal. Do not let
air out to match the specified cold
pressure. The tire will be
underinflated.
You should get your own tire
pressure gauge and use it whenever
you check your tire pressures. This
will make it easier for you to tell if a
pressure loss is due to a tire problem
and not due to a variation between
gauges.
Recommended Tire Pressures for
Normal Driving
The following chart shows the
recommended cold tire pressures for
most normal driving conditions and
speeds. Tire pressures for high
speed driving are the same as for
normal driving.
Tire Size Cold Tire Pressure
for Normal Driving
225/60R16 98T 36 psi (250 kPa , 2.5
kgf/cm )
The compact spare tire pressure is:
60 psi (420 kPa , 4.2 kgf/cm )