Simply put, retreading is the process whereby selected and inspected worn tyres, called “casings,” receive a new tread. Only sound, carefully inspected tyre casings are used for retreading. The worn tread is buffed away and a new tread bonded to the tyre body in a process very similar to the manufacture of a new tyre. There are different processing techniques, but the ultimate objective is always the same – affixing a new tread through the application of heat, time and pressure.
The links below provide further detailed information:
Legal Requirements – ECE108 is for Car / ECE109 is for Truck.