Tire Wear: Notes

WARNING: This page is about a different car, the 2013 Hyundai Tucson and 2012 Hyundai Tucson. However, it is still accessible from the selected car via links, so may be relevant.

Measure the tread depth of the tires.
Tread depth [limit]: 1.6 mm (0.063 in.)
If the remaining tread (A) depth 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: Identifying Tire Tread Depth And Wear Indicators
Courtesy of HYUNDAI MOTOR CO.