Check your tread depth before winter and after 25,000 miles

You should change your tires when the tread wears down to 2/32 of an inch, which is the legal minimum in most states. The easiest way to check is the penny test: insert a penny into the tread with Lincoln's head upside down. If you can see the top of his head, the tread is too shallow and the tires need to be replaced. Most tires last between 25,000 and 50,000 miles depending on your driving habits and road conditions.

Winter tires should go on before temperatures drop below 45 degrees Fahrenheit consistently, usually in October or November depending on where you live. Winter tires have a different rubber compound that stays flexible in cold weather, giving you better grip on snow and ice than all-season tires. If you live somewhere that gets snow, switching to winter tires is more important than waiting for the tread to wear down — a tire with good winter tread in cold weather outperforms a worn all-season tire every time.

Key Takeaways

  • Replace tires when tread depth reaches 2/32 of an inch, which you can check with the penny test at home.
  • Most tires last 25,000 to 50,000 miles, but this varies based on your driving style, road conditions, and tire quality.
  • Switch to winter tires when temperatures stay below 45 degrees Fahrenheit, usually in fall, rather than waiting for tread to wear down.
  • Uneven wear patterns — bald spots on one side or center — signal alignment or pressure problems that need fixing before you replace the tires.

Signs that your tires are wearing unevenly

Tires that wear faster on the edges than the center, or vice versa, are telling you something is wrong with alignment, tire pressure, or suspension. Edge wear usually means your tires are underinflated or your wheels are out of alignment. Center wear means overinflation. Both problems will destroy new tires just as fast as old ones, so get the issue fixed before you buy replacements.

Check your tire pressure monthly when the tires are cold — before you drive or at least three hours after driving. The correct pressure is printed on a sticker inside your driver's door frame, not on the tire itself. Underinflated tires wear faster, reduce fuel economy, and generate heat that can cause a blowout. Overinflated tires wear in the center and give you a rougher ride.

What to do if you notice bulges or cracks in the sidewall

A bulge or blister on the sidewall of a tire means the internal structure is failing and the tire can blow out without warning. This is not safe to drive on, even for a short distance. Replace the tire when ready — do not wait for the tread to wear down. A crack in the sidewall that you can see or feel is also a reason to replace the tire right away.

Small cracks in the tread grooves are usually just surface damage from age and weather and do not require replacement. But if you see a crack that runs across the tread or into the sidewall, or if the crack is deep enough to catch your fingernail, the tire should be replaced. When in doubt, have a tire shop look at it — most shops will inspect your tires for free.

Seasonal tire changes and storage

If you use winter tires, switch back to all-season or summer tires when temperatures consistently stay above 45 degrees, usually in April or May. Winter tires wear faster in warm weather because the rubber compound is softer. Switching back saves money by extending the life of both sets of tires.

Store off-season tires in a cool, dry place away from direct sunlight and heat sources. A basement or garage works well. If you stack them, put the heaviest tires on the bottom. Some people store tires on the rims to keep them in shape, while others remove them from the rims — either way works, but storing them on rims takes up more space. Tires stored properly can last several seasons.

How tire age affects safety even if tread looks fine

Tires degrade over time regardless of how much you drive them. The rubber hardens and loses grip as it ages, especially in hot climates. Most tire manufacturers recommend replacing tires every six to ten years, even if the tread looks acceptable. You can find the tire's age by looking at the DOT code on the sidewall — the last four digits show the week and year it was made.

A tire made in 2018 or earlier should be inspected closely before you keep using it, and a tire older than 2013 should be replaced. This matters most for spare tires, which sit unused and age faster than tires you drive on regularly. Check your spare tire's age and condition before you need it in an emergency.

When to patch versus replace a tire

A small puncture in the tread — smaller than 1/4 inch across — can be patched if the damage is not near the sidewall or shoulder. A patch costs $10 to $25 and takes about 30 minutes. Punctures in the sidewall, shoulder, or near the edge of the tread cannot be safely patched and require replacement.

If your tire has multiple punctures or a puncture larger than 1/4 inch, replacement is the safer choice. A tire shop can assess the damage and tell you whether patching is an option. If you patch a tire and the puncture is actually larger than it appears, the patch will fail and you could have a blowout while driving.

Tire replacement costs and what affects the price

Tire prices vary widely based on size, brand, and quality. A basic all-season tire for a sedan might cost $80 to $150 per tire, while a premium brand or larger tire for an SUV could cost $200 to $400 per tire. Winter tires typically cost more than all-season tires. Installation and balancing usually add $15 to $30 per tire.

Buying tires online and having them installed at a local shop is often cheaper than buying from the shop directly, though some shops charge extra for mounting tires you did not buy from them. Compare prices at multiple shops and online retailers before you decide. Some tire shops offer warranties or road hazard protection that covers punctures or damage — ask what is included before you pay.

Frequently Asked Questions

How do I know if my tires are the right pressure?

Find the correct pressure on a sticker inside your driver's door frame — not on the tire sidewall, which shows the maximum pressure. Check pressure when tires are cold, before you drive or three hours after driving. Use a tire pressure gauge, which costs $5 to $15 and is available at any auto parts store.

Can I use all-season tires in winter instead of buying winter tires?

All-season tires work in light snow, but winter tires are significantly safer in heavy snow and ice because the rubber stays flexible in cold weather. If you live where snow is rare, all-season tires are fine. If you get regular snow, winter tires are worth the cost — they reduce stopping distance and improve control when it matters most.

What does it mean if my tires are wearing on the inside edge only?

Inside edge wear usually signals that your wheels are out of alignment or your suspension needs adjustment. Get an alignment check at a tire shop or mechanic — this typically costs $75 to $200 but prevents your new tires from wearing the same way. Driving on misaligned wheels also reduces fuel economy and affects handling.

Is it safe to drive on a tire with a slow leak?

A slow leak that loses a few pounds of pressure per month is safe to drive on as long as you check pressure weekly and keep it at the correct level. But find the leak and patch or replace the tire soon — a slow leak can become a fast one without warning, and a flat tire on the highway is dangerous.

Do I need to replace all four tires at once?

If one tire is damaged beyond repair, you can replace just that tire if the others have similar tread depth. If three tires are worn and one is new, the new tire will wear faster because it has more grip. For best results, replace tires in pairs (front or rear) or all four at once, especially if you have all-wheel drive.