Ford F-150 Owner's Manual page 376

Note: Some spare tires operate at a higher inflation pressure than the
other tires. For T-type mini-spare tires, see the Dissimilar Spare Tire
and Wheel Assembly Information section. Store and maintain at 60 psi
(4.15 bar). For full-size and dissimilar spare tires, see Dissimilar Spare
Tire and Wheel Assembly Information under Changing a Road Wheel
in this chapter. Store and maintain at the higher of the front and rear
inflation pressure as shown on the Tire Label.
6. Visually inspect the tires to make sure there are no nails or other objects
embedded that could poke a hole in the tire and cause an air leak.
7. Check the sidewalls to make sure there are no gouges, cuts or bulges.
Inspecting Your Tires and Wheel Valve Stems
Periodically inspect the tire treads for uneven or excessive wear and
remove objects such as stones, nails or glass that may be wedged in the
tread grooves. Check the tire and valve stems for holes, cracks, or cuts
that may permit air leakage and repair or replace the tire and replace
the valve stem. Inspect the tire sidewalls for cracking, cuts, bruises and
other signs of damage or excessive wear. If internal damage to the tire is
suspected, have the tire demounted and inspected in case it needs to be
repaired or replaced. For your safety, tires that are damaged or show
signs of excessive wear should not be used because they are more likely
to blow out or fail.
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
When the tire tread wears down to the same height as these wear bars,
the tire is worn out and must be replaced.
2013 F-150 (f12)
Owners Guide gf, 3rd Printing, February 2013
USA (fus)
Wheels and Tires
When the tread is worn down to
1/16th 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
1/16th of an inch (2 millimeters).
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