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Pre-Travel Information
Tire Size
To maintain tire safety, purchase new tires that are the same
size as the vehicle’s original tires or another size recommend-
ed by the manufacturer. Look at the Tire and Loading Infor-
mation label, 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 Size & Type Designation
The tires on your unit may for example, be marked with a
designation of ST 225/75R15. ST stands for Standard Trail-
er, and the number breaks down as follows:
• The first three-digit number gives the width in millime-
ters
of the tire from sidewall edge to sidewall edge. In gener-
al, the larger the number, the wider the tire.
• The next two-digit number after the “slash” mark, known
as the aspect ratio, gives the tire’s ratio of height to
width.
• R – The “R” stands for radial.
• The last two-digit number is the wheel or rim diameter
in inches.
Speed Rating
• Typical ST tires have a speed rating designation of "L",
which is 75 mph (under normal inflation and load condi-
tions.)
• DO NOT exceed the speed rating regardless of the post-
ed maximum speed limit.
• Tires are warranted by the tire manufacturer,
not by Grand Design RV.
If you need tire warranty assistance, please contact your
dealer or refer to the tire warranty pamphlets provided with
your RV.
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