Tire retreating, also known as recapping or remolding, is a re-creating method applied on tires and wheels to replace the their worn parts and to make them usable again. The retreating process often preserves %90 of the materials used in spent tires and costs way lower than buying or manufacturing a new tire.
This process includes highly serious procedures as the tires to be treated will be used for vehicles. The video you're going to see below shows a tire retreating process.
If you're interested in it then check it and see how it's done!!!