FOUR WINDS INTERNATIONAL
Vehicle manufacturers determine this number based on the vehicle’s design load limit, that is, the
greatest amount of weight a vehicle can safely carry and the vehicle’s tire size. The proper tire
pressure for the recreation vehicle is referred to as the “recommended cold inflation pressure”.
(As you read below, it is difficult to obtain the recommended tire pressure if the tires are not cold.)
Because tires are designed to be used on more than one type of vehicle, tire manufacturers list the
“maximum permissible inflation pressure” on the tire sidewall. This number is the greatest amount
of air pressure that should ever be put in the tire under normal driving conditions.
It is important to check your recreation vehicles tire pressure before each trip for the following
reasons:
• Most tires may naturally lose air over time
• Tires can lose air suddenly if you drive over a pothole or other object or if you strike the
curb when parking
• With radial tires, it is usually not possible to determine under inflation by visual
inspection
NOTE:
For convenience, purchase a tire pressure gauge to keep in the recreation vehicle.
Gauges can be purchased at tire dealerships, auto supply stores, and other retail outlets.
The recommended tire inflation pressure that vehicle manufacturers provide reflects the
proper psi when a tire is cold. The term cold does not relate to the outside temperature.
Rather, a cold tire is one that has not been driven on for at least three hours. When you drive, your
tires get warmer, causing the air pressure within them to increase. Therefore, to get an accurate
tire pressure reading, you must measure tire pressure when the tires are cold or
compensate for the extra pressure in warm tires.
To maintain tire safety, purchase new tires that are the same size and rating as the recreation
vehicles original tires or another size recommended by the manufacturer. Look at the tire
information placard, the chassis owner’s manual, or the sidewall of the tire you are replacing to find
this information. If you have any doubt about the correct size to choose, consult with the tire
dealer and chassis manufacturer.
Chassis Operations & Procedures
3-3
Checking Tire Pressure
Tire Size
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