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When one of your tires goes out, it is replaced with a donut tire (also called a spare tire, although a spare tire is typically the same size as a regular tire).

Unless you drive one of the select few vehicles that are equipped with a full-size matching spare tire, your spare tire is not the same as the other four that are on your vehicle.

A spare tire is solely meant for use in an emergency, or as a short term replacement for a flat or damaged tire.