What PSI should my spare tire be at?
The PSI for your spare depends on the spare type: a temporary donut typically requires about 60 psi, while a full-size spare uses the same pressure as your regular tires (as listed on the door placard or in the owner's manual).
Understanding your spare’s pressure needs matters because incorrect inflation can affect handling, braking, and tire wear in an emergency. Spares come mainly in two configurations—donut (temporary) and full-size—each with its own inflation rule. Always verify the exact figure for your car model to stay safe on the road.
Types of spare tires
There are two main spare configurations you’ll encounter on modern cars.
- Donut spare (temporary): smaller and lighter, typically inflated to about 60 psi; intended for short-term use only and limited speeds/distances.
- Full-size spare: same size as your regular tire and inflated to the same recommended pressure as your normal tires (as shown on the door placard or in the manual).
Knowing which type you have helps you follow the correct inflation rules and drive safely until you can repair or replace the tire.
Where to find the PSI specification
PSI guidance for your spare is not universal; it’s model-specific. Use these sources to confirm the correct figure.
- Driver's door jamb placard: lists recommended pressures for front, rear, and sometimes the spare.
- Vehicle owner's manual: provides official spare tire guidance and any limits on use.
- Spare tire sidewall or label: some donuts have their own inflation rating printed on the tire.
- Spare wheel label or packaging: may include a chart with exact PSI and speed/distance limits.
Always rely on the vehicle’s official sources for the precise figure to avoid under- or over-inflation.
Practical steps to check and adjust spare pressure
Use these steps to ensure your spare is ready when you need it.
- Park on a level surface and let the tire cool before measuring pressure.
- Remove the valve cap and attach a reliable tire pressure gauge; record the current reading.
- Inflate or deflate to the recommended PSI for your spare (from the door placard, manual, or spare sidewall) without exceeding the tire’s maximum rating.
- Re-check with the gauge and securely reinstall the valve cap.
- If you’re using a donut spare, note its speed and distance limits (commonly about 50 mph / 80 km/h) and plan to repair the punctured tire as soon as possible.
Maintaining the correct spare pressure reduces the risk of harm or failure during an emergency drive.
Safety considerations
Temporary spares are not a substitute for proper tire service. Use a donut spare only for brief, low-speed transit to a repair facility, and avoid highway speeds or long distances. Check your specific limits in the manual or on the spare itself.
Summary
In short, the correct spare tire PSI depends on whether you have a donut or a full-size spare. Donuts are typically inflated to around 60 psi and intended for short-term use, while full-size spares should be inflated to the same pressure as your normal tires per your vehicle’s door placard or manual. Always verify the exact specification for your car model and check the spare pressure regularly so you’re prepared in an emergency.
