Section 2 --- Driving & Safety
The Executive 2005
84
Tire Vibration
Sudden tire failure is often preceded by tire vibration. Symptoms that can cause tire failure are a
bulge in the sidewall or swelling in the tire carcass. Striking an object or large hole in the road sur-
face can damage a tire. Inspect the tires periodically thereafter as rotational forces can continue to
stress damaged areas and later manifest in tire failure. If an unusual vibration begins, or a bulge is
noticed in the sidewall, have the tires evaluated by a qualified professional as soon as possible.
Tire Rotation
Tire rotation can increase the useful life of the tires by achieving uniform wear on all of the tires.
Have the tire manufacturer determine the rotation pattern. The first tire rotation is the most important
in determining which rotation pattern to use. Any unusual or unique wear patterns, or indications of
uneven wear that may have developed, should be evaluated for possible tire rotation. Misalignment,
imbalance or other mechanical problems may exist and will need to be corrected prior to rotation.
Tread
To prevent skidding and hydroplaning, replace tires when the tread is worn down to 4/32 of an inch
on the front, and 2/32 of an inch on the rear. Questions regarding tread wear should be directed to the
tire manufacturer.
Built in tread wear indicators, or “wear bars” which look like narrow strips of smooth rubber across
the tread, will appear on the tire when the tread is worn down to one-sixteenth of an inch. When “wear
bars” are noticed, the tire should be replaced.
Visually check the tires for signs of uneven wear. Signs of irregular tread wear are usually exhibited
by low or unusually smooth areas on the tire surface. Consult the tire manufacturer as soon as possible.
WARNING:
In many instances the life of the tires on the motorhome is not determined by mileage
but by age. Tires are subject to weathering. Weathering cracks run in circumference
with the tire. Though the sidewall of the tire may look fine and be structurally sound,
weathering can occur inside the well of the tread, therefore replacement may be deter-
mined not by mileage but age. Have the tire manufacturer inspect the tires for age
weathering.
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