It is not usually necessary to purchase new tires when getting an alignment. However, your technician might still find one of more issues after visual and computerized inspections. For instance, it's best to fix worn suspension and steering system components or low or uneven tire pressure and replace worn tires before performing an alignment since those conditions make it challenging for your vehicles wheels maintain optimal contact with the road and maintain the alignment settings as per your vehicle requirements.
So depending on your cars conditions , new tires could still be needed . But just for the alignment by its self tires don't have be purchased.
