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| Boilerpipe Text | Why Tread Depth is Important
The difference in handling between new tires and only 2/32nds of an inch of tread remaining can be significant. New tires have a full depth of tread, often between 8/32nds and 12/32nds, which provides excellent traction and grip on the road. This means that they will handle better in wet or slippery conditions, and will have better braking performance.
Tires with 2/32nds of tread, on the other hand, have reduced traction and grip on the road, especially in wet or slippery conditions. Braking performance is affected as the tires will canât displace as much water as new tires, leading to longer stopping distances. Tires with less tread will also generate more heat which can lead to increased wear and tear on the tires, and potentially even
cause a blowout.
The reduced handling and traction of worn tires also increase the risk of hydroplaning because the channels between the tread blocks as well as the sipes are much smaller. Water or snow gets trapped between the tire and the ground, creating a slippery barrier that prevents contact.
Itâs important to have tires with enough tread depth to ensure the vehicleâs safety on the road. Thatâs why itâs recommended to replace tires when the tread depth reaches 4/32nds of an inch. Theyâre completely worn out when thereâs just 2/32nds of an inch of tread depth remaining or when the tread wear indicator is visible.
How to Measure Tire Tread Depth
There are a few common and free or inexpensive methods for checking how much tread depth remains. Two of the three tests only involve pocket change.
1. Perform the Penny Test
The penny test is a simple and easy method to check the tread depth of your tires to determine if your tires need to be replaced or if they are still safe to drive on. The test is done by inserting a penny between the tread blocks.
To perform the penny test, start by finding the tread wear indicator on your tires. These are small raised bumps that are located in the grooves of the tread. They are usually located at the base of the tread and are designed to let you know when your tires are worn down to the minimum legal limit.
Once you have located the tread wear indicator, take a penny and insert it into the groove of the tread with Lincolnâs head facing down. If the top of Lincolnâs head is visible, then your tread depth is less than 2/32 of an inch, which means itâs time to replace your tires. If the top of Lincolnâs head is not visible, then your tread depth is greater than 2/32 of an inch, and your tires would likely pass a state inspection.
The penny test should be done on multiple locations of the tire, both in the center and at the edges, as the tread depth can vary across the tire.
2. Perform the Quarter Test
The quarter test is another simple and easy method to check tread depth. Similar to the penny test, it is a quick way to determine if your tires need to be replaced or if they are still safe to drive on using a quarter.
To perform the quarter test, take a quarter and insert it into the groove of the tread with George Washingtonâs head facing down. If the top of George Washingtonâs head is visible, then your tread depth is less than 4/32 of an inch, which means itâs time to replace your tires. If the top of George Washingtonâs head is not visible, then your tread depth is greater than 4/32 of an inch and your tires are safe to drive on.
3. Use a Tread Depth Gauge
Tread depth gauges are a cost-effective tool for measuring the remaining tread depth. Theyâre usually equipped with measurements in both fractions of an inch or millimeters, whichever you prefer. A t-shaped frame has a small measuring stick like a caliper that can be extended for extremely accurate measurements, and itâs the best way to check tread on all tires, especially newer ones with plenty of depth remaining.
Place the flat section against the tread, spanning two tread blocks, then press the stick downward until it presses against the tire. Read the measurement and repeat in several spots around the tire.
If one or more tires have less than 4/32nds of an inch of tread depth remaining, itâs time to
consider changing them
. Replace tires in pairs, and be sure to match the size, type, and speed rating of your old tires. You can get the parts you need at your local
AutoZone
Store. If the job is too big for you, seek out one of our
Preferred Shops
to help you do the job.
FAQ/People Also Ask
You can measure tread depth using a penny or a quarter, but the most accurate measurement is by using a tread depth gauge.
Insert a quarter between the tread blocks with Washingtonâs head pointed downward. If you can see the top of his head, the tread is less than 4/32nds remaining.
The penny test is accurate for determining the depth related to 2/32nds of an inch. However, it canât tell you how much more (or less) there might be.
You can check your tread at home with a tread depth gauge, or use the penny test or quarter test to assess the depth.
If your tires have 2/32nds of an inch or more, they will pass most state inspections. However, the general rule is that you need 4/32nds of tread depth remaining for safe driving. |
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# How to Check Tire Tread Depth
Safe braking, accelerating, and steering all require traction between the tires and the road surface. And in the US, around one in four vehicles on the road has at least one tire thatâs worn out and needs to be replaced. Itâs a concern that could lead to an accident or harrowing blowout.
Tires arenât the least expensive parts to replace, and itâs understandable that you might want to prolong that expense as long as possible However, itâs important to know how to check tire tread depth. It serves a few purposes:
- To identify worn-out tires that need to be replaced
- Uneven wear helps identify potential steering or suspension problems
- To know when to rotate the tires and the best position to put them in
For either no cost at all or for the minimal cost of a tread depth gauge, you can keep an eye on your tires.
In this article
Why Tread Depth is Important
How to Measure Tire Tread Depth
1\. Perform the Penny Test
2\. Perform the Quarter Test
3\. Use a Tread Depth Gauge
FAQ/People Also Ask
[Tire Tread Depth Gauge](https://www.autozone.com/tire-repair-and-tire-wheel/tire-tread-depth-gauge?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to)
[Buy Now](https://www.autozone.com/tire-repair-and-tire-wheel/tire-tread-depth-gauge?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to "Buy Now")
## Why Tread Depth is Important
The difference in handling between new tires and only 2/32nds of an inch of tread remaining can be significant. New tires have a full depth of tread, often between 8/32nds and 12/32nds, which provides excellent traction and grip on the road. This means that they will handle better in wet or slippery conditions, and will have better braking performance.
Tires with 2/32nds of tread, on the other hand, have reduced traction and grip on the road, especially in wet or slippery conditions. Braking performance is affected as the tires will canât displace as much water as new tires, leading to longer stopping distances. Tires with less tread will also generate more heat which can lead to increased wear and tear on the tires, and potentially even [cause a blowout.](https://www.autozone.com/diy/tire-wheel/tire-sidewall-blowout-how-to-address-holes-in-the-tire-sidewall)
The reduced handling and traction of worn tires also increase the risk of hydroplaning because the channels between the tread blocks as well as the sipes are much smaller. Water or snow gets trapped between the tire and the ground, creating a slippery barrier that prevents contact.
Itâs important to have tires with enough tread depth to ensure the vehicleâs safety on the road. Thatâs why itâs recommended to replace tires when the tread depth reaches 4/32nds of an inch. Theyâre completely worn out when thereâs just 2/32nds of an inch of tread depth remaining or when the tread wear indicator is visible.
**Related: [Tire Removal Tools](https://www.autozone.com/diy/tire-wheel/best-tire-changing-tools)**
## How to Measure Tire Tread Depth
There are a few common and free or inexpensive methods for checking how much tread depth remains. Two of the three tests only involve pocket change.
### 1\. Perform the Penny Test
The penny test is a simple and easy method to check the tread depth of your tires to determine if your tires need to be replaced or if they are still safe to drive on. The test is done by inserting a penny between the tread blocks.
To perform the penny test, start by finding the tread wear indicator on your tires. These are small raised bumps that are located in the grooves of the tread. They are usually located at the base of the tread and are designed to let you know when your tires are worn down to the minimum legal limit.
Once you have located the tread wear indicator, take a penny and insert it into the groove of the tread with Lincolnâs head facing down. If the top of Lincolnâs head is visible, then your tread depth is less than 2/32 of an inch, which means itâs time to replace your tires. If the top of Lincolnâs head is not visible, then your tread depth is greater than 2/32 of an inch, and your tires would likely pass a state inspection.
The penny test should be done on multiple locations of the tire, both in the center and at the edges, as the tread depth can vary across the tire.
### 2\. Perform the Quarter Test
The quarter test is another simple and easy method to check tread depth. Similar to the penny test, it is a quick way to determine if your tires need to be replaced or if they are still safe to drive on using a quarter.
To perform the quarter test, take a quarter and insert it into the groove of the tread with George Washingtonâs head facing down. If the top of George Washingtonâs head is visible, then your tread depth is less than 4/32 of an inch, which means itâs time to replace your tires. If the top of George Washingtonâs head is not visible, then your tread depth is greater than 4/32 of an inch and your tires are safe to drive on.
### 3\. Use a Tread Depth Gauge
Tread depth gauges are a cost-effective tool for measuring the remaining tread depth. Theyâre usually equipped with measurements in both fractions of an inch or millimeters, whichever you prefer. A t-shaped frame has a small measuring stick like a caliper that can be extended for extremely accurate measurements, and itâs the best way to check tread on all tires, especially newer ones with plenty of depth remaining.
Place the flat section against the tread, spanning two tread blocks, then press the stick downward until it presses against the tire. Read the measurement and repeat in several spots around the tire.
If one or more tires have less than 4/32nds of an inch of tread depth remaining, itâs time to [consider changing them](https://www.autozone.com/diy/tire-wheel/when-to-replace-your-tires?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to). Replace tires in pairs, and be sure to match the size, type, and speed rating of your old tires. You can get the parts you need at your local [AutoZone](https://www.autozone.com/locations/?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to) Store. If the job is too big for you, seek out one of our [Preferred Shops](https://www.autozone.com/lp/find-a-repair-shop) to help you do the job.
**Related: [When To Replace Your Tires](https://www.autozone.com/diy/tire-wheel/when-to-replace-your-tires)**
## FAQ/People Also Ask
How to measure tire tread depth
You can measure tread depth using a penny or a quarter, but the most accurate measurement is by using a tread depth gauge.
How do I know if my tire tread is 4/32nds?
Insert a quarter between the tread blocks with Washingtonâs head pointed downward. If you can see the top of his head, the tread is less than 4/32nds remaining.
Is the penny test for tires accurate?
The penny test is accurate for determining the depth related to 2/32nds of an inch. However, it canât tell you how much more (or less) there might be.
How do you check your tire tread at home?
You can check your tread at home with a tread depth gauge, or use the penny test or quarter test to assess the depth.
How do I know if my tire tread is good?
If your tires have 2/32nds of an inch or more, they will pass most state inspections. However, the general rule is that you need 4/32nds of tread depth remaining for safe driving.
## Related Posts
[](https://www.autozone.com/diy/truck-and-towing/tire-repair-kit-buying-guide)
Tire Repair Kit Buying Guide
Don't let a flat tire slow you down. Check out our Tire Repair Kit Buying Guide on repairing your tire quickly and efficiently.
[Read MoreTire Repair Kit Buying Guide](https://www.autozone.com/diy/truck-and-towing/tire-repair-kit-buying-guide)
[](https://www.autozone.com/diy/tire-wheel/best-snow-tire-chains)
Best Snow Tire Chains: Buyer's Guide for 2026
Drive safely in winter with our 2026 Snow Tire Chains Buyer's Guide. Discover key factors for selection and top recommendations with AutoZone.
[Read MoreBest Snow Tire Chains: Buyer's Guide for 2026](https://www.autozone.com/diy/tire-wheel/best-snow-tire-chains)
[](https://www.autozone.com/diy/tire-wheel/how-to-replace-a-tire-pressure-sensor)
How to Replace a Tire Pressure Sensor
Discover how to replace a faulty tire pressure sensor with help from AutoZone. Get the right TPMS tools, parts, and expert tips to restore accurate tire pressure readings.
[Read MoreHow to Replace a Tire Pressure Sensor](https://www.autozone.com/diy/tire-wheel/how-to-replace-a-tire-pressure-sensor)
[](https://www.autozone.com/diy/tire-wheel/how-often-do-i-need-a-wheel-alignment)
How Often Do I Need a Wheel Alignment?
Learn how often you need a wheel alignment, why itâs important, and the signs your car may be out of alignment. Keep your tires lasting longer and your drive smoother.
[Read MoreHow Often Do I Need a Wheel Alignment?](https://www.autozone.com/diy/tire-wheel/how-often-do-i-need-a-wheel-alignment)
[](https://www.autozone.com/diy/tire-wheel/how-do-wheel-locks-works)
How Do Wheel Locks Work and Do I Need It?
Learn how wheel locks work, what the wheel lock key does, and whether theyâre worth it for your car. Explore the pros, cons, and what to do if you lose your wheel lock key.
[Read MoreHow Do Wheel Locks Work and Do I Need It?](https://www.autozone.com/diy/tire-wheel/how-do-wheel-locks-works)
[](https://www.autozone.com/diy/tire-wheel/spare-tire-emergency-jack-maintenance)
Why Maintaining Your Spare Tire & Emergency Jack is Crucial
[Read MoreWhy Maintaining Your Spare Tire & Emergency Jack is Crucial](https://www.autozone.com/diy/tire-wheel/spare-tire-emergency-jack-maintenance)
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| Readable Markdown | Why Tread Depth is Important
The difference in handling between new tires and only 2/32nds of an inch of tread remaining can be significant. New tires have a full depth of tread, often between 8/32nds and 12/32nds, which provides excellent traction and grip on the road. This means that they will handle better in wet or slippery conditions, and will have better braking performance.
Tires with 2/32nds of tread, on the other hand, have reduced traction and grip on the road, especially in wet or slippery conditions. Braking performance is affected as the tires will canât displace as much water as new tires, leading to longer stopping distances. Tires with less tread will also generate more heat which can lead to increased wear and tear on the tires, and potentially even [cause a blowout.](https://www.autozone.com/diy/tire-wheel/tire-sidewall-blowout-how-to-address-holes-in-the-tire-sidewall)
The reduced handling and traction of worn tires also increase the risk of hydroplaning because the channels between the tread blocks as well as the sipes are much smaller. Water or snow gets trapped between the tire and the ground, creating a slippery barrier that prevents contact.
Itâs important to have tires with enough tread depth to ensure the vehicleâs safety on the road. Thatâs why itâs recommended to replace tires when the tread depth reaches 4/32nds of an inch. Theyâre completely worn out when thereâs just 2/32nds of an inch of tread depth remaining or when the tread wear indicator is visible.
How to Measure Tire Tread Depth
There are a few common and free or inexpensive methods for checking how much tread depth remains. Two of the three tests only involve pocket change.
### 1\. Perform the Penny Test
The penny test is a simple and easy method to check the tread depth of your tires to determine if your tires need to be replaced or if they are still safe to drive on. The test is done by inserting a penny between the tread blocks. To perform the penny test, start by finding the tread wear indicator on your tires. These are small raised bumps that are located in the grooves of the tread. They are usually located at the base of the tread and are designed to let you know when your tires are worn down to the minimum legal limit. Once you have located the tread wear indicator, take a penny and insert it into the groove of the tread with Lincolnâs head facing down. If the top of Lincolnâs head is visible, then your tread depth is less than 2/32 of an inch, which means itâs time to replace your tires. If the top of Lincolnâs head is not visible, then your tread depth is greater than 2/32 of an inch, and your tires would likely pass a state inspection. The penny test should be done on multiple locations of the tire, both in the center and at the edges, as the tread depth can vary across the tire.
### 2\. Perform the Quarter Test
The quarter test is another simple and easy method to check tread depth. Similar to the penny test, it is a quick way to determine if your tires need to be replaced or if they are still safe to drive on using a quarter. To perform the quarter test, take a quarter and insert it into the groove of the tread with George Washingtonâs head facing down. If the top of George Washingtonâs head is visible, then your tread depth is less than 4/32 of an inch, which means itâs time to replace your tires. If the top of George Washingtonâs head is not visible, then your tread depth is greater than 4/32 of an inch and your tires are safe to drive on.
### 3\. Use a Tread Depth Gauge
Tread depth gauges are a cost-effective tool for measuring the remaining tread depth. Theyâre usually equipped with measurements in both fractions of an inch or millimeters, whichever you prefer. A t-shaped frame has a small measuring stick like a caliper that can be extended for extremely accurate measurements, and itâs the best way to check tread on all tires, especially newer ones with plenty of depth remaining. Place the flat section against the tread, spanning two tread blocks, then press the stick downward until it presses against the tire. Read the measurement and repeat in several spots around the tire.
If one or more tires have less than 4/32nds of an inch of tread depth remaining, itâs time to [consider changing them](https://www.autozone.com/diy/tire-wheel/when-to-replace-your-tires?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to). Replace tires in pairs, and be sure to match the size, type, and speed rating of your old tires. You can get the parts you need at your local [AutoZone](https://www.autozone.com/locations/?intcmp=BLG:BDY:1:20230202:00000000:GEN:how-to) Store. If the job is too big for you, seek out one of our [Preferred Shops](https://www.autozone.com/lp/find-a-repair-shop) to help you do the job.
FAQ/People Also Ask
You can measure tread depth using a penny or a quarter, but the most accurate measurement is by using a tread depth gauge.
Insert a quarter between the tread blocks with Washingtonâs head pointed downward. If you can see the top of his head, the tread is less than 4/32nds remaining.
The penny test is accurate for determining the depth related to 2/32nds of an inch. However, it canât tell you how much more (or less) there might be.
You can check your tread at home with a tread depth gauge, or use the penny test or quarter test to assess the depth.
If your tires have 2/32nds of an inch or more, they will pass most state inspections. However, the general rule is that you need 4/32nds of tread depth remaining for safe driving. |
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