Spare tires, often smaller and lighter than standard tires, typically require higher inflation pressure due to their construction and intended use as temporary replacements. This higher pressure, usually listed on a sticker in the vehicle’s owner’s manual or on the tire itself, maintains the tire’s shape and load-carrying capacity, even with a smaller volume. For example, a compact spare tire might require 60 psi, significantly higher than the 30-35 psi common for standard tires.
Correct tire inflation is critical for safe vehicle operation. Underinflation can lead to tire overheating, tread separation, and blowouts, while overinflation can reduce traction and increase the risk of damage from road hazards. Maintaining the recommended pressure for a spare tire ensures its readiness for use in an emergency and maximizes its safe operational life. Historically, spare tires have evolved alongside vehicles, transitioning from full-size spares to space-saving and temporary spares to address efficiency and weight concerns. This evolution underscores the continued importance of understanding specific inflation requirements for safe and effective usage.