Rubber degrades over time. If your spare is over 10 years old , it should likely be replaced even if it looks unused. Spare Tire Information Guide - Goodyear
Ensure the spare can support your vehicle's weight. Temporary spares often have a maximum speed limit of 50 mph . buy spare tire
Most temporary spares are designed for no more than 50 miles of travel at a maximum speed of 50 mph . Rubber degrades over time
Check your spare's air pressure at every oil change, as they lose pressure over time even when not in use. buy spare tire