There are several indicator arrows on the side of the tire. Try to locate and follow the indicator arrows as marked in circle number one. For number two circle, first two digits mean the week and the last two digits the year of production. So 3318 means that tire was manufactured in the 33rd week of 2018.-

Indicator bars are embedded between the ribs of the tread. If the tread is flush with the indicator bar. It is time to replace your tire.-