Replace your tires when the tread is worn to 2/32 in (4/32 in if you often drive on wet roads), when they are 6 to 10 years old, or when they show cracks, bulges, or uneven wear, whichever comes first. Below are the tread, age, and mileage guidelines, how to check your tires, the signs that call for an earlier change, and what happens if you wait.
When to Replace Tires
When to change tires depends on four factors: tread depth, age, condition, and mileage. Replace them as soon as one of these reaches its limit:
- Tread depth: 2/32 in is the legal minimum in most U.S. states; AAA recommends replacing at 4/32 in.
- Age: automakers recommend replacing tires every 6 years regardless of use, and several tire makers set 10 years as the maximum service life, according to NHTSA’s tire aging report.
- Condition: cracks, bulges, blisters, uneven wear, or vibration that balancing and alignment don’t fix.
- Mileage: the tire’s treadwear warranty shows the mileage the maker expects; tread depth and age still decide first.
When to Replace Tires by Mileage
No single mileage applies to all tires: tread life depends on the tire, your driving, your roads, and maintenance. Use the tire’s treadwear warranty as the maker’s mileage estimate, and replace the tires earlier if the tread reaches 2/32 in (4/32 in for wet roads). Low-mileage tires still age out, so replace them at 6 to 10 years even if tread remains. See how long tires last by tire type.
How to Check Your Tires
Check your tires at least once a month in three steps: tread depth, tire pressure, and damage and age.
Check the Tread Depth
Measure the tread with a tread depth gauge or the penny test at several points across each tire. Replace the tire at 2/32 in, or at 4/32 in if you drive on wet roads. Uneven wear across the tread points to a pressure, alignment, or suspension problem; see tire wear patterns.
Check the Tire Pressure
Check the pressure at least once a month with a tire gauge, when the tires are cold (not driven for at least three hours). Inflate them to the pressure on the tire placard on the door edge or door post, or in the owner’s manual. The number on the tire sidewall is the maximum pressure the tire can hold, not the recommended one. If the TPMS light stays on after you inflate the tires to the recommended pressure, have them checked.
Check for Damage and Age
Look over the whole tire, tread and sidewalls, for cuts, cracks, bulges, nails, and objects caught in the tread, and read the DOT code for the tire’s age. A puncture can be repaired only in the tread area and only if it is 1/4 in (6 mm) or smaller; damage that reaches the shoulder or sidewall means the tire must be replaced.
When to Change Tires: Real-Life Scenarios
Tread Depth Is Too Low
Replace tires at 2/32 in, the legal minimum in most U.S. states. For safe grip, replace them at 4/32 in if you drive on wet roads and at 5/32 in if you drive on snow. Use the Penny Test: put a penny into the tread with Lincoln’s head down; if you can see the top of his head, the tread is at 2/32 in or less and the tires need replacing now.
Tires Are Over 6 Years Old
Rubber degrades with age through oxidation, even when the tire looks fine and the tread is deep. Automakers recommend replacing tires every 6 years, and several tire makers set 10 years as the maximum. Check the DOT code on the sidewall: its last four digits show the week and year the tire was made.
Tire Age | Recommended Action |
|---|---|
0–5 years | Routine inspections |
6–10 years | Consider replacement regardless of tread |
10+ years | Replace immediately |
You See Cracks, Dry Rot, or Bulges
Replace a tire with a bulge or bubble: it means the internal structure is damaged, and it can’t be repaired. Most bulges come from impacts with potholes, curbs, or road debris, and they can appear days after the hit, so check your tires after a hard pothole impact. Cracks, missing rubber chunks, and uneven tire wear also weaken the tire and raise the risk of a blowout; have a specialist check them.
You Feel Excessive Vibration While Driving
Vibration through the steering wheel or seat points to a tire or wheel problem: imbalance, an out-of-round tire, a bent wheel, or uneven wear. First have the tires balanced and the wheels and alignment checked, and do a tire rotation if they wear unevenly. If the vibration stays after these fixes, replace the tire. See the other signs of bad tires while driving.
What Happens If You Replace the Tires Later?
Driving on worn or aged tires raises the risk of a blowout, cuts grip on wet and snowy roads, and lengthens braking distance.
Risk of Blowouts
Old and worn tires are more likely to fail suddenly, especially at high speeds and in hot climates, because their weakened internal structure can’t handle the pressure and heat build-up. Replace them on time.
Poor Traction in Wet or Snow Conditions
Tread depth sets how much water and snow a tire can handle. Tires start to lose hydroplaning resistance and snow traction at 6/32 in, and wet traction drops at 4/32 in.
Tread Depth | What It Means |
|---|---|
10/32" and more | New tire tread depth |
8/32" | Near new tread depth |
6/32" | Safe, but starting to lose snow traction and hydroplaning resistance |
5/32" | Reduced snow and ice performance; replace before winter if you drive on snow |
4/32" | Reduced wet traction; replace if you drive on wet roads |
3/32" | Critically low; minimal wet traction and longer wet braking |
2/32" | Legal minimum in most states; replace now |
Is 6/32 tread good? Yes. 6/32 in is a safe tread depth, but the tire is starting to lose snow traction and hydroplaning resistance.
Longer Braking Distances
Worn tread increases braking distance, most of all on wet roads. In AAA testing, tires worn to 4/32 in needed 43% more distance to stop on wet pavement from 60 mph, 87 extra feet for a passenger car. When the car on new tires had stopped, the car on worn tires was still moving at 40 mph.
Got Questions on When to Change Tires?
If your tires have reached the tread, age, or damage limits above, replace them. Search your tires at NeoTires: orders get same-day dispatch and arrive in 2-3 business days across the U.S., and tires labeled Free Shipping ship free. For help choosing, call +1 302-276-8361.
Drive safe and choose your tires wisely!
