Tire wear on a used car: what should I look for?
Reading the wear pattern
Even wear across the tread suggests the tires are rotated and the alignment is reasonable. Wear on one edge, a feathered pattern, or a cupped surface can signal alignment, worn shocks, or unbalanced tires. Check all four tires, since a matched set is more expensive to replace than a single one.
- Even wear across the full tread
- Wear on one edge or the center only
- Feathering or cupping on the surface
Checking age and depth
The date code is a four-digit number on the sidewall, where the first two digits are the week and the last two are the year. Tires older than several years can harden and crack even with good tread. Measure depth with a gauge or use a coin placed in the groove to get a rough reading.
Using the findings
Worn or uneven tires are a good negotiating point, since a new set can cost a noticeable amount. Ask the seller or a shop to check alignment before you accept the car. Note the findings in your inspection notes so the numbers are clear.
Common mistakes
- Checking only the front tires and missing a problem on the rear.
- Ignoring the date code on tires that look fine.
- Replacing tires without checking alignment, so the new ones wear the same way.
