Cars
7 steps
Discovering that the spare tire is flat just when you get a puncture is a common situation, but it can be avoided with a simple periodic inspection. Even when unused, the spare tire loses pressure and undergoes natural degradation, which can compromise safety and functionality in emergencies. This article explains how to inflate the spare tire correctly, identify signs of wear, and ensure the emergency kit is ready for use.
Why the spare tire loses pressure even when unused
The spare tire, like any tire, gradually loses pressure due to natural characteristics of the rubber and valve. Rubber porosity, temperature changes, and climate contribute to this loss, even if the tire has been stored for months or years.
Where to find the correct spare tire pressure
The recommended pressure for the spare tire may vary depending on the vehicle model, and it is essential to follow the guidance in the owner's manual or on the tire pressure label.
Difference between temporary and full-size spare tires
The spare tire can be classified into two types: temporary (compact spare) and full-size. Each has specific characteristics and limitations.
When to replace the spare tire
Even when unused, the spare tire ages over time. Rubber degradation can be identified by signs such as cracks, dryness, bulges, cuts, or deformation.
Why you should also check the tools
Having a properly inflated spare tire does not solve the problem if the emergency tools are in poor condition. Periodic inspection should include the vehicle's entire emergency kit.
How to inflate the spare tire
Essential steps to ensure safety in emergency situations
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1. Locate the spare tire
Open the spare tire compartment and remove the protective valve cap.
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2. Check the current pressure
Use a reliable tire pressure gauge to measure the current pressure.
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3. Check the recommended pressure
Consult the vehicle manual or tire pressure label for the recommended pressure.
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4. Adjust the pressure
Adjust the pressure until it reaches the indicated value, making sure the valve is unobstructed.
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5. Visual inspection
Visually inspect the tread and tire sidewalls for signs of wear.
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6. Check the tire's age
Check the DOT code on the tire sidewall to confirm its age.
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7. Repeat the inspection
Repeat the inspection every 30 days or before long trips.
Difference between temporary and full-size spare tires
| Type | Characteristics | Limitations |
|---|---|---|
| Temporary spare tire | Smaller size, higher pressure, and speed and distance limitations | Speed: up to 80 km/h; Distance: up to 50 km |
| Full-size spare tire | Dimensions similar to everyday tires, proper pressure, and longer usage time | Can be used for longer periods as long as it is kept in good condition |
Important Tips
Check the spare tire pressure along with the other tires to identify pressure differences.
Keep the valve cap installed to protect against dirt and leaks.
Before long trips, perform a complete inspection of the emergency kit.
Frequently asked questions
Quick answers to common questions.
What pressure should I use for the spare tire?
The correct pressure is indicated in the vehicle manual or on the tire pressure label. In many cars, the spare tire uses a different pressure from the tires used daily.
How often should I inflate the spare tire?
Ideally, check the pressure at least once a month and always before long trips.
Does an unused spare tire lose pressure?
Yes. Even when not in use, the tire gradually loses air due to the natural characteristics of the rubber and valve.
Can I use a temporary spare tire for several days?
It is not recommended. This type of spare tire has speed and distance limitations that must be respected.
How do I know if the spare tire is too old?
Check for signs of dryness, cracks, and the manufacturing date stamped on the tire sidewall.
Can a bald spare tire be used in an emergency?
No. A worn spare tire compromises safety just like any other tire.
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