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Pre-Travel Information
MAXIMUM PERMISSIBLE INFLATION PRESSURE
This number is the greatest amount of air pressure that should
ever be put in the tire under normal driving conditions.
SPEED RATING
• Typically tires with a ST designation are speed re-
stricted to 75 mph under normal inflation and load
conditions.
• Typically tires with a LT designation are speed restrict-
ed to 75 mph under normal inflation and load condi-
tions. Do not exceed these speed ratings regardless
of the posted maximum speed limit.
Tires are warranted by the tire manufacturer and not by Grand
Design RV. In the event that you need tire warranty assistance,
please contact your dealer or refer to the tire warranty pam-
phlets provided with your RV for details.
HOW OVERLOADING AFFECTS YOUR RV & TIRES
The results of overloading can have serious consequences for
passenger safety. Too much weight on your vehicle’s suspension
system can cause spring, shock absorber, or brake failure, han-
dling or steering problems, irregular tire wear, tire failure or other
damage. An overloaded vehicle is hard to drive and hard to stop.
In cases of serious overloading, brakes can fail completely, par-
ticularly on steep hills.
The load a tire will carry safely is a combination of the size of
tire, its load range, and corresponding inflation pressure. Exces-
sive loads and/or under-inflation cause tire overloading and, as
a result, abnormal tire flexing occurs. This situation can generate
an excessive amount of heat within the tire. Excessive heat may
lead to tire failure.
It is the air pressure that enables a tire to support the load, so
proper inflation is critical. Since RVs can be configured and
loaded in many ways, air pressures must be determined from
actual loads (determined by weighing) and taken from the load
and inflation tables provided by the tire manufacturer. These air
pressures may differ from those found on the certification label.
However, they should never exceed the tire limitation for load or
air pressure. If you discover that your tires cannot support the
actual weights, the load will need to be lightened.
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