A spare tire can be used permanently, but it is not recommended. While a spare tire is designed to be a temporary replacement for a flat tire, it is not meant to be used for an extended period of time. A spare tire is usually smaller than the regular tires on your car and does not have the same tread pattern. This means that it will not provide the same level of traction and stability as your regular tires. In addition, a spare tire is not designed to handle the wear and tear of everyday driving. over time, using a spare tire as your primary tire can cause damage to your car's suspension and alignment.