The penny test is a popular and straightforward method to determine if your tires have enough tread depth.
- Find a penny: Locate a U.S. penny.
- Locate a tread groove: Choose a point on your tire where the tread appears the lowest and find a tread groove.
- Insert the penny: Place the penny into the tread groove with Abraham Lincoln’s head pointing down towards the tire.
- Observe Lincoln’s head: Check to see if you can see the very top of Lincoln’s head.
- If you can see the top of Lincoln’s head: Your tire tread is less than 2/32nd of an inch, and your tires are likely worn to the point where they need to be replaced.
- If the top of Lincoln’s head is covered by the tread: Your tire tread depth is still above 2/32nd of an inch, and your tires are likely safe to continue driving on.
The distance from the edge of a penny to the top of Lincoln’s head is approximately 2/32nd of an inch, [notes Tire Outlet] . This is the minimum legal tread depth requirement in most U.S. states.
- The Quarter Test: For a more proactive approach, you can also use a quarter. Place a quarter into the tread groove with George Washington’s head facing down. If the tread touches the top of Washington’s head, you have at least 4/32nd of an inch of tread remaining. Some experts suggest replacing tires when they reach 4/32nds of an inch for better safety, especially in wet or snowy conditions.
- Check multiple spots: It’s important to check the tread depth at several locations around each tire, as wear can be uneven.
- Uneven Wear: Uneven tire wear can be a sign of other issues, such as improper inflation or misalignment, and should be inspected by a mechanic.
- Alternatives: While the coin tests are quick and easy, you can also use a dedicated tread depth gauge for a more precise measurement.
- Tread Wear Indicators: Many tires have built-in tread wear indicator bars (also called wear bars) that become flush with the tread when the depth reaches 2/32nd of an inch.
Checking your tire tread depth regularly is crucial for your safety and the longevity of your tires. The coin tests are simple and effective ways to help you stay on top of this important maintenance task.
What is the 25 cent tire test?
CHECK YOUR TIRE TREAD Here’s how to check your tread with a Canadian quarter: Insert a 25-cent coin in one of the grooves with the caribou facing down. If you see the tip of its nose, it means the tread depth is less tahn 6/32”, so the tire probably won’t last all winter, or 10,000 km.