How old is too old for tires?

Concerns & risks

You were trying to decide whether old-but-deep tires are fine, since your weekend car barely moves.

Tires age even if you don't drive much.

Causes & evidence

NHTSA notes some manufacturers recommend replacing tires 6 to 10 years old regardless of tread. The last four digits of the DOT code show the week and year made. See tire pressure and tread.

What to do

1. Find the DOT code on the sidewall.
2. Last four digits: week and year (e.g., 0318 = 3rd week of 2018).
3. Check your vehicle and tire maker's guidance.
4. Look for cracks.

Common mistakes: Common mistakes: assuming low miles means fresh tires. Rubber ages with time, heat and sun. Look for fine cracks on sidewalls and in tread grooves. Store vehicles out of direct sun when possible. Check spare tire age too, since it might be the original. Buy tires from sources that can confirm manufacture dates. If you're unsure of a tire's age, a tire shop can read the code with you and explain the maker's recommendations. Replacing an aged spare is often forgotten.

Speed Man tip: Spares age too.

Wrap-up: Check the DOT date. 6–10 years guidance. Cracks = replace.