Peterbilt 579 - Page 373

TIRES AND WHEEL
1 3
Proper-Ination: the
Over-Ination:
correct prole
for full reduces the
tread
contact with the road. contact area
with
the road surface,
TREAD CONTACT
concentrating all
of
TREAD CONTACT
WITH ROAD
the vehicle
weight
WITH ROAD
on the
center of the
tread. This causes
premature wear of the
2
tire.
Under-Ination:
causes abnormal
tire
deection, which builds
up excessive heat,
running the risk of
TREAD CONTACT
failure. It also causes
WITH ROAD
irregular wear.
Overloaded Tires
Overloading your
truck is as damaging
to your tires as underination. The
following chart shows how neglect or
deliberate abuse can affect the life of
your tires.
5
EFFECT OF LOAD PRESSURE ON TIRE LIFE
Vehicle
Load Normal
20% Over 40% Over 60% Over 80% Over 100% Over
Tire
Pressure Normal
20% Low 30% Low 35% Low 45% Low 55% Low
Expected Total
Tire
Mileage
Normal
70% 50% 40% 30% 25%
Overinated Tires
Too
much air pressure reduces the tire
tread contact area and results in rapid
wear in the center of the tread.
(04/13) Y53-6047–2C 5-137