Symptoms
- Haven't checked the spare tire in years
- Not sure if the jack and lug wrench are still in the car
- Spare looks visibly low or the rubber looks cracked
Likely causes
- CommonSpare naturally loses air over time like any tireEven unused spares slowly lose pressure through the valve and rubber.
- PossibleRubber dry rot from ageSpares, especially full-size ones, can dry rot after 6–10 years even with little use.
- PossibleJack or lug wrench missing or damagedTools are sometimes removed and not returned after a previous repair.
What to do
- Locate the spare tire, usually under the trunk floor or mounted underneath the vehicle, and check that it's actually there.
- Check its pressure with a gauge; compact spares often need higher pressure than regular tires (check the sidewall or manual).
- Look at the rubber for cracking, dry rot, or obvious age, especially if the spare is more than 8–10 years old.
- Confirm the jack, lug wrench, and any required tools are present and in working condition.
- Air up the spare if low, and replace it if it shows dry rot or is severely aged, even if it's never been used.
- Recheck the spare's pressure every few months along with your regular tires.
Tools and parts
- Tire pressure gauge
Replacement spare tire, if neededSearch: “spare tire for [your car year make model]”
When to call a pro
No professional needed to check; if the jack or tools are missing, most dealerships or auto parts stores can source replacements.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.