Brochure

Localized patches of
fast wear creating a
scalloped appearance.
Diagonal wear - flat
spots worn diagonally.
Localized flat spots
across the tread, often
repeating around the
tread circumference.
Even wear across
tread face and
around tire
circumference.
Tread depth varies
around tire with
maximum difference
approximately 180
degrees apart.
A result of moderate to
severe assembly out of
balance condition.
Diagnose imbalance
condition. Tires
should be rotated to
drive axle.
Mount as outside drive
dual with change in
rotation of tire.
Heavy axle loads;
such wear often
occurs on short
wheelbase tractors and
on long wheelbase
straight trucks.
Usually a result of
excessive radial runout
or non-uniformity in
the rotating assembly.
Runout and/or out of
balance in conjunction
with a slow rate of
wear. Can also be
caused by a loose
wheel bearing.
Carefully match
equipment with service
requirements. Consult
vehicle and tire
manufacturers when
specifying equipment
or replacing tires.
Replace or correct
as necessary. Rotate
tire to trailer dual.
Description Appearance Possible Cause Solution
Cupping/scallop wear/
dished out areas
Diagonal wear - flat
spots worn diagonally
Overall fast wear -
good wear pattern, but
fast rate of wear
Out of round tire
Under-inflation wear
Tread is worn unevenly
toward the edges of the
tire – when properly
inflated the tire appears
round when viewed
across the tread face.
Under-inflation causes
the tire to collapse,
forcing more wear on
the edges of the tread.
Keep tires properly
inflated.
– 14 –