DIAGNOSIS AND TESTING
TIRE NOISE
Unusual tire noise can be associated with tire and wheel vibration or irregular tire wear. For vibration issues, (Refer to 22 - TIRES/WHEELS - DIAGNOSIS AND TESTING). For irregular tire wear issues, (Refer to 22 - TIRES/WHEELS/TIRES - DIAGNOSIS AND TESTING).
TIRE/VEHICLE LEAD
(Refer to 2 - SUSPENSION/WHEEL ALIGNMENT - DIAGNOSIS AND TESTING)
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.
Excessive toe-in or toe-out causes wear on the tread edges and a feathered effect across the tread.
TREAD WEAR INDICATORS
Tread wear indicators are molded into the bottom of the tread grooves. When tread depth is 1.6 mm (1/16 in.), the tread wear indicators will appear as a 13 mm (1/2 in.) band (3).
Tire replacement is necessary when indicators appear in two or more grooves or if localized balding occurs.