User Manual - Page 311

For LINCOLN 2017 NAVIGATOR.

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Improper or inadequate vehicle
maintenance can cause tires to wear
abnormally. Inspect all your tires,
including the spare, frequently, and
replace them if one or more of the
following conditions exist:
Tire Wear
E142546
When the tread is worn down to one
sixteenth of an inch (2 millimeters), tires
must be replaced to help prevent your
vehicle from skidding and hydroplaning.
Built-in treadwear 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
(2 millimeters).
When the tire tread wears down to the
same height as these wear bars, the tire
is worn out and must be replaced.
Damage
Periodically inspect the tire treads and
sidewalls for damage (such as bulges in
the tread or sidewalls, cracks in the
tread groove and separation in the tread
or sidewall). If damage is observed or
suspected have the tire inspected by a
tire professional. Tires can be damaged
during off-road use, so inspection after
off-road use is also recommended.
Age
WARNINGS
Tires degrade over time depending
on many factors such as weather,
storage conditions, and conditions of
use (load, speed, inflation pressure) the
tires experience throughout their lives.
In general, tires should be replaced
after six years regardless of tread
wear or even if they have not been used.
However, heat caused by hot climates
or frequent high-load conditions can
accelerate the aging process and may
require you to replace tires more
frequently.
You should replace your spare tire
when you replace the road tires or
after six years due to aging even if it has
not been used.
308
Navigator (TB5) Canada/United States of America, enUSA, First Printing
Wheels and Tires
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