Symptoms
- Not sure if tires are still safe or need replacing
- Reduced grip noticed in rain
- Tires look worn but you're not sure how worn
Likely causes
- CommonNatural wear over miles drivenAll tires wear down gradually and eventually reach the legal and safe minimum tread depth.
- PossibleUneven wear from alignment or inflation issuesTread can wear unevenly across the tire, meaning one area might read fine while another is worn.
- PossibleOlder tires with shallow tread from age rather than mileageTires that sit unused for years can develop wear or aging issues independent of tread depth.
What to do
- Use a tread depth gauge (inexpensive at any auto parts store) or a penny for a quick check.
- For the penny test, insert it into the tread groove with Lincoln's head upside down and facing you; if you can see all of his head, tread is at or below 2/32 inch and needs replacing.
- Check tread depth in multiple spots around each tire (inner, center, outer), since wear isn't always even.
- Compare tread depth across all four tires to catch uneven wear patterns.
- Consider replacing before hitting the legal minimum if you drive frequently in rain or snow, since wet traction drops noticeably below 4/32 inch.
- Recheck every few months, especially before winter or a long road trip.
Tools and parts
- Tread depth gauge or a penny
Replacement tires, correct size for your vehicleSearch: “tire size for [your car year make model]”
When to call a pro
If tread is at or below 2/32 inch anywhere, or you see uneven wear patterns, have a tire shop inspect and recommend replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.