Tire replacement is necessary when indicators
appear in two or more grooves or if localized balding
occurs.
TIRE WEAR PATTERNS
Under inflation will cause wear on the shoulders of
tire. Over inflation will cause wear at the center of
tire.
Excessive camber causes the tire to run at an
angle to the road. One side of tread is then worn
more than the other (Fig. 3).
Excessive toe-in or toe-out causes wear on the
tread edges and a feathered effect across the tread
(Fig. 3).
TIRE NOISE OR VIBRATION
Radial-ply tires are sensitive to force impulses
caused by improper mounting, vibration, wheel
defects, or possibly tire imbalance.
To find out if tires are causing the noise or vibra-
tion, drive the vehicle over a smooth road at varying
speeds. Note the noise level during acceleration and
deceleration. The engine, differential and exhaust
noises will change as speed varies, while the tire
noise will usually remain constant.
VEHICLE LEAD DIAGNOSIS AND CORRECTION
Use the following chart to diagnose a vehicle that
has a complaint of a drift or lead condition. The use
of the chart will help to determine if the lead condi-
tion is the result of a bad tire or is caused by the
front wheel alignment.
Fig. 3 Tire Wear Patterns
Fig. 2 Tread Wear Indicators
1 – TREAD ACCEPTABLE
2 – TREAD UNACCEPTABLE
3 – WEAR INDICATOR
LH TIRES AND WHEELS 22 - 3
DIAGNOSIS AND TESTING (Continued)
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