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WHEELS AND TYRES
7
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.