If you ever visit an auto museum, you'll see most antique cars were equipped with two or more spare tires. Fortunately today's roads and improved tire durability have reduced that necessity, allowing our vehicles to be equipped with a single spare or none at all! While some of today's vehicles are equipped with spares that match the other tires and wheels on the vehicle, they are in the minority. Now most vehicles are originally equipped with a "temporary-use" spare tire and wheel that probably differs in size and construction from the other tires and wheels on the vehicle. And some vehicles are even delivered without a spare tire and wheel thanks to the extended mobility provided by modern run-flat tires or temporary repair and inflation systems.