Honda FOURTRAX 2018 Owner's Manual page 183

Tyres
Air Pressure
Refer to Safety Precautions on page 103.
Properly inflated tyres provide the best combination of handling,
tread life, and riding comfort. Generally, underinflated tyres wear
unevenly, adversely affect handling, and are more likely to fail from
being overheated. Overinflated tyres make your ATV ride harshly, are
more prone to damage from surface hazards, and wear unevenly.
Make sure the air valve caps are secure. If necessary, install new
caps.
(cont'd)
Servicing Your Honda 173