Buying new tyres is an important investment and from the start you will need to make sure that you maintain them well. Even if you do take care of them as good as you can, they will wear out over time and it is important to know when this time has come. From the day that you have new tyres it is important to track the tread depth and how it decreases over time. It is good to keep a log of the tread depth. Initially you will not check it as often, maybe every 6 months, but then maybe every 3rd month until you can start to predict when they will be worn out. When you are getting close to 4 mm remaining tread depth you can check even more often to ensure that you change before you lose vital properties of the tyres that can be lifesaving. For more information regarding when to change to a new set of tyres, visit: https://coxcarsonline.com/know-when-your-tyres-are-worn-out-and-it-is-time-to-change-to-new-ones/