Tires: Testing and Inspection

Tire Inspection

Irregular and Premature Wear
Irregular and/or premature wear results from many causes including the following: incorrect inflation pressures, non-rotated tires, rough driving and improper wheel alignment.
If the following conditions are noted, tire rotation is necessary:
^ Front tires wear differently from rear tires.
^ Uneven wear between both sides of tread on the same tire.
^ Both front tires wear unevenly.
^ Both rear tires wear unevenly.
^ Abnormal wear such as cupping and flat spotting is noted.
Wheel alignment should be checked if the following conditions are noted:
^ Front tires wear unevenly.
^ Uneven wear between both sides of tread on the same front tire.
^ Front tire treads show scuffs with "feather" edges on one side of tread ribs or blocks.








Wear Indicators
Originally installed tires have built-in tread wear indicators (1).
These indicators appear as 7 mm (0.27 in) wide bands when the tire tread depth becomes 1.6 mm (0.063 in).
If a tire has indicators (1) appearing across 3 or more tread grooves at 6 locations, replacement of the tire is recommended.

Tire wear limit
limit: 1.6 mm (0.063 in)