20
Understanding Tire Pressure and Load Limits
Tire inflation pressure is the level of air in the tire that provides it with
load-carrying capacity and affects the overall performance of the
vehicle. The tire inflation pressure is a number that indicates the
amount of air pressure—measured in pounds per square inch (psi) -
a tire requires to be properly inflated. (You will also find this number
on the vehicle information placard expressed in kilopascals (kPa),
which is the metric measure used internationally.)
The listed amount is for maximum load capacity. When traveling
with less then full weight, you may wish to reduce air pressure for
smoother ride.
While driving, your tires will get warmer, causing air pressure to
increase. To get an accurate pressure reading, you must allow tires
to cool for three (3) hours.
For convenience, purchase a tire pressure gauge to keep in your
vehicle. Gauges can be purchased at tire dealerships, auto supply
stores and other retail outlets.
The recommended tire inflation pressure that vehicle manufactures
provide reflects the proper psi when a tire is cold. The term cold,
does not relate to the outside temperature.
After driving with your RV and suspect underinflated tires, inflate up
to specs. Recheck air pressure after 3 hour cool down.
Tire Size
To maintain tire safety, purchase new tires that are the same size
and load rating as the vehicle’s original tires. Look at the tire
information placards 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.
Tire Tread
The tire tread provides the gripping action and traction that prevent
your vehicle from slipping or sliding, especially when the road is wet
or icy. In general, tires are not safe and should be replaced when
the tread is worn down to 1/16 of an inch. Tires have built-in tread
wear indicators that let you know when it is time to replace your
tires. These indicators are raised sections spaced intermittently in
the bottom of the tread grooves. When they appear “even” with the
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