315 / 948
WHEELS AND TYRES
6
B. TYRE WEAR PATTERN
FORM OF WEAR
MAJOR CAUSES
PATTERN
Tyre wears in multi-
angle form
(particularly
conspicuous on
shoulders)
Tyre and / or wheel centers are offset or bent
Hub and / or spindle centers are offset or bent
Looseness in wheel bearings and / or kingpins
Imbalances in rotating components
Approximately half of
tyre wears
excessively quickly
Imbalances in rotating components
Tyre and / or wheel centers are offset
Hub and / or spindle centers are offset or bent
One particular place
on tyre wears
excessively quickly
This is often caused by spot (localized wear) first
occurring because of sudden application of the
brakes or sudden starting which is aggravated as the
vehicle continues to be operated
A patch has been applied inside the tyre
Shoulder on one side
of tyre (generally
outside shoulder)
wears excessively
quickly
Incorrect camber and / or toe-in
Frequently turning sharp corners
Alternate spots on
both shoulders wear
Looseness in wheel bearings and / or kingpins
Tyre and / or wheel centers are offset or bent
In the case of the rib
tyre only one side of
the rib wears, and the
tread takes on the
form of saw teeth
Frequently turning sharp corners
Incorrect camber and or toe-in
In the case of edge of
the lugs wears
quickly, so the tread
takes on the form of
saw teeth
When lug tyres are fitted on the front wheels the
dominant force working on them is the braking force,
making this sort of wear liable to occur.
This is an inherent characteristic of lug tyres when
overloaded or under inflated. When such wear
occurs, the direction of rotation of the tyre should be
changed. This can be done by refitting the tyre in the
same rim such that the earlier inside sidewall is now
outside sidewall. Do not include the tyre in rotation till
the wear normalizes.