When the tread is worn down to one sixteenth of an inch (2 mm), tires must be replaced to help prevent your vehicle from skidding and hydroplaning. Built-in treadwear indicators, or wear bars, which look like narrow strips of smooth rubber across the tread will appear on the tire when the tread is worn down to one sixteenth of an inch (2 mm).
When the tire tread wears down to the same height as these wear bars, the tire is worn out and must be replaced.
The tires should also be balanced periodically. An unbalanced tire and wheel assembly may result in irregular tire wear.
Periodically inspect the tire treads for uneven or excessive wear and remove objects such as stones, nails or glass that may be wedged in the tread grooves.