Honda FourTrax Rubicon TRX520FA5 2020 Owner's Manual page 198

Tires
Always check air pressure when your tires are "cold." If you check air
pressure when your tires are "warm" — even if your ATV 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 tire pressures,
the tires will be underinflated. Be sure to check tire pressure at the
riding site, since changes in altitude can affect air pressure.
The recommended "cold" tire pressures are:
RECOMMENDED
PRESSURE
188 Servicing Your Honda
FRONT
4.4 psi (30 kPa)
REAR
4.4 psi (30 kPa)