Honda Civic Si 2005 Owner's Manual page 154

Tires
If you check air pressures when the
tires are hot (driven for 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 readings. This
is normal. Do not let air out to match
the recommended cold air pressure.
The tire will be underinflated.
You should use your own tire
pressure gauge 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.
158
While tubeless tires have some
ability to self-seal if they are
punctured, you should look closely
for punctures if a tire starts losing
pressure.
Recommended Tire Pressures
The following chart shows the
recommended cold tire pressures for
most normal and high-speed driving
conditions.
Tire Size Cold Tire Pressure
for Normal Driving
P205/55R16 89V 30 psi (210 kPa ,
2.1 kgf/cm )
60 psi (420 kPa ,
Compact spare
4.2 kgf/cm )
For convenience, the recommended
cold air pressures and tire sizes are
on a label on the driver's doorjamb.
For additional information about
your tires, see page 195 .