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CHASSIS
Wheels and Tires
Wheels and Tires Size and D.O.T. Code
This article provides basic information about the wheels and tires, including the tire size, inflation, and D.O.T. codes.
Newmar’s quality extends to every inch of your coach, right
down to the tires and wheels. The durability and longevity
of your tires will provide you with the confidence and
peace of mind you need to relax and enjoy the ride.
The primary areas of concern are the tire size, inflation,
and operational information. The sidewall of the tire
contains detailed information about the construction,
inflation, and carrying capacity of the tire. Become familiar
with this information, and operate the vehicle within the
capacity parameters outlined.
Proper tire maintenance is critical to the safety,
operation, and durability of your coach. Failure to
follow and monitor tire pressure guidelines may result
in premature tire failure.
WARNING
!
The sidewall of the tire contains information that is important to know to ensure proper use of the tire, as well as to
maintain long life. Take the time to become familiar with the size, load rating, and pressure information listed on the
sidewalls of the tires.
This tire size is 315 / 80 R 22.5. From this size, we can
determine the physical dimensions of the tire, as well as
its basic construction. The tire size breaks down like this:
•
The first number, “315”, is the section width of
the tire in millimeters. The section width is the
measurement of the tire from the outside sidewall to
the inside sidewall.
•
The second number is the height of the sidewall,
expressed as a percentage of the section width. In
this case, the number is “80”, so the sidewall height
accounts for 80 percent of the tire’s section width.
•
The “R” in the tire size indicates that this tire is
“radial” in construction. The belts are wrapped
around the tire in a radial design, from bead to bead.
•
The final number is “22.5”, which is the rim size the
tire was designed to fit. This tire fits a 22.5” diameter
wheel.
Tire Size
The last four digits on tires manufactured after the year
2000 signify the week and year of manufacture.
The tire in the example picture was made during the 29th
week of 2017.
D.O.T. Code
This article provides information about the care and maintenance of your coach tires, including examples of labels and tire
pressure charts. To ensure your tires are operating safely, regularly inspecting your tires and checking your tire pressure is
absolutely mandatory.
Tire pressures should be checked and adjusted before and after each trip. Always check and adjust the pressures while the
tires are cold. Never add or release pressure from the tires when they are hot (after having driven a mile or more).
Tire Care and Maintenance