Tire wear

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Measure the tread depth of the tires.
Tread depth [limit]: 1.6 mm (0.063 in.)
If the remaining tread depth (A) is less than the limit, replace the tire.
NOTE: When the tread depth of the tires is less than 1.6 mm (0.063 in.), the wear indicators (B) will appear.

Fig 1: Measuring Tire Depth
Courtesy of KIA MOTORS AMERICA, INC.