Honda NRX1800 2004 Owner's Manual page 139

Tires
Always check air pressure when your tires
are ''cold'' –– after the motorcycle has
been parked for at least three hours. If you
check air pressure when your tires are
''warm'' –– even if your motorcycle has
only been ridden for a few miles –– the
readings will be higher. If you let air out
of warm tires to match the recommended
cold pressures, the tires will be
underinflated.
130
Servicing Your Honda
The recommended ''cold'' tire pressures
are:
36 psi
front
(250 kPa , 2.50 kgf/cm )
42 psi
rear
(290 kPa , 2.90 kgf/cm )