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WHEELS AND TYRES
7
C. WEAR CAUSES
PROBLEM
CAUSE
PATTERN
Shoulder Wear
Both Shoulders wearing
faster than the centre of
the tread
1. Under Inflation
2. Repeated high-speed cornering
3. Improper matching of rims and tyres
4. Tyres haven't been rotated recently
Centre Wear
The centre of the tread is
wearing faster than the
shoulders
1. Over-inflation
2. Improper matching of rims and tyres
3. Tyres haven't been rotated recently
One-sided wear
One side of the tyre
wearing unusually fast
1. Improper wheel alignment (especially
camber)
2. Tyres haven't been rotated recently
Spot wear
A part (or a few parts) of
the circumference of the
tread are wearing faster
than other parts.
1. Faulty suspension, rotating parts or brake
parts
2. Dynamic imbalance of tyre/rim assembly
3. Excessive run out of tyre and rim assembly
4. Sudden braking and rapid starting
5. Under inflation
Feather-edged wear
The blocks or ribs of the
tread are wearing in a
feather-edge pattern
1. Improper wheel alignment (faulty toe-in)
2. Bent axle beam