What Should Your Spare Tire Air Pressure or PSI Be

What Should Your Spare Tire Air Pressure or PSI Be

The spare tire is a component of vehicle maintenance that is frequently disregarded. Many people believe that because something isn’t used frequently, it doesn’t require much attention. But nothing could be further from the truth than this. Maintaining your spare tire properly is essential if you want to make sure that you’re ready for roadside emergencies involving flat tires.

When it comes to your spare tire, the air pressure is among the most crucial considerations. In this article, we will discuss how to check and inflate your spare tire, the recommended PSI (pounds per square inch) for it, and other crucial considerations.

Understanding PSI and How it Relates to Spare Tires

Let’s start by discussing what PSI is in reality. PSI is a measurement of the air pressure in a tire, put simply. On the sidewall of the tire or in your vehicle’s owner’s manual, you can find the recommended PSI for a tire. It’s crucial to keep in mind that the suggested PSI will change depending on the kind of tire and vehicle you have.

It’s critical to realize that there are various types of spare tires, each with a specific recommended PSI. The recommended PSI for temporary or “doughnut” spare tires, which are typically smaller and intended for brief use, will be lower than that of a full-size spare tire. Checking the recommended PSI for your specific spare tire is crucial because either an overinflated or underinflated spare tire can create hazardous driving conditions.

Checking the Air Pressure in Your Spare Tire

It’s crucial to regularly check the air pressure in your spare tire to make sure it’s properly inflated. A straightforward tire pressure gauge, which is available at the majority of auto parts stores, can be used for this procedure, which is fairly simple.

Start by removing the valve cap from your spare tire before checking the air pressure. Get a reading by pressing the tire pressure gauge against the valve stem. Comparing this reading to the PSI that is suggested for your particular spare tire. It’s time to blow up the tire if the pressure is too low. It’s necessary to release some air if the pressure is too high. Remember to check your spare tire’s air pressure when it’s cold, that is, after it hasn’t been driven on recently.

Factors that Affect Spare Tire Air Pressure

Factors that Affect Spare Tire Air Pressure

The air pressure in your spare tire can change depending on a number of variables. Temperature is one of the most important. The pressure inside your tire will alter along with the temperature outside. Because the pressure will be more precise when the tire is cold, it is crucial to check the air pressure in your spare tire at that time.

Driving is another factor that may have an impact on the spare tire’s air pressure. The spare tire’s pressure will decrease as you put more miles on it. For this reason, it’s imperative to regularly check the air pressure in your spare tire, especially if you’re using it as a stand-in for a flat tire.

Properly Inflating a Spare Tire

If you discover that your spare tire requires inflation, the procedure is fairly simple. To make sure you’re filling the tire to the proper PSI, you’ll need a tire pressure gauge and a compressor or hand pump.

It’s important to follow the right safety procedures when inflating your spare tire. Prior to starting the process, the car should always be in a secure position. Additionally, never inflate tires past the recommended PSI because doing so can result in a burst tire and hazardous driving conditions.

Remove the valve cap first, then connect the compressor or pump to the valve stem to begin inflating the tire. Slowly inflate the tire, making sure to keep it within the recommended PSI range by checking the pressure frequently with the gauge. Replace the valve cap after the tire has been properly inflated, and you’re ready to go.

Regular Maintenance and Additional Tips

Checking and re-inflating the air in your spare tire is only one aspect of maintaining it properly. Additionally, it’s critical to pay attention to the tire’s general state. Look for any wear or damage indications, including cuts, punctures, and uneven wear. It’s best to have the tire checked by a professional if you notice any problems to make sure it’s safe to use.

In addition to routine maintenance, it’s a good idea to pay close attention to the spare tire’s expiration date. Many spare tires are only good for a short time and need to be replaced after a certain period of time. Typically, you can find this information in the owner’s manual for your car or on the sidewall of the tire.

Finally, it’s wise to keep a can of fix-a-flat or another sealant in your car at all times. If you have a flat tire, this can save your life and get you and your car to a safe area where you can fix the tire or properly re-inflate it.


In conclusion, keeping your spare tire properly maintained is essential to ensuring that you are ready for unforeseen flat tire situations on the road. Knowing the recommended PSI for your particular spare tire, checking and inflating it frequently, and monitoring the tire’s overall condition are all crucial maintenance procedures. Additionally, remember to keep a sealant on hand, check the expiration date of your spare tire, and always put your safety first when handling any tire-related tasks.