When Should You Replace Tires?
Replace tires when tread depth reaches 2/32 inch (the legal minimum), or ideally at 4/32 inch for better wet traction. Most tires last 25,000-50,000 miles depending on type and driving habits. Also replace tires older than 6-10 years regardless of tread, as rubber degrades with age. Check for uneven wear, cracks, bulges, or vibrations.
Key Takeaways
- The penny test is a quick tread check: insert a penny with Lincoln's head down into the tread.
- Winter tires lose effectiveness faster than all-season tires and should be replaced at 5/32 inch.
- Spare tires also age and should be checked even if never used.
Explanation
The penny test is a quick tread check: insert a penny with Lincoln's head down into the tread. If you can see the top of his head, tread is below 2/32 inch and replacement is legally required. For better safety margins, use a quarter - if Washington's head is visible, you are at 4/32 inch and should plan replacement.
Tire age matters as much as tread. Rubber compounds degrade from oxidation and UV exposure even if the tire is not used. Check the DOT code on the sidewall - the last four digits indicate week and year of manufacture (e.g., 2419 = 24th week of 2019). Replace tires over 6 years old regardless of appearance, and never use tires over 10 years old.
Warning signs requiring immediate replacement include bulges or bubbles (internal damage), cracks in sidewalls, exposed cords or wires, persistent vibration while driving, and uneven wear patterns. Uneven wear often indicates alignment or suspension issues that should be fixed before installing new tires.
Things to Know
- Winter tires lose effectiveness faster than all-season tires and should be replaced at 5/32 inch.
- Spare tires also age and should be checked even if never used.
- Run-flat tires should be replaced after a puncture even if repaired.