Several coins are commonly used to assess tire tread depth, with the penny and quarter being the most popular in the United States. These methods offer a quick and straightforward way to gauge whether a tire needs replacement based on legal minimums and safety recommendations.
- The penny test involves inserting a U.S. penny into the tire tread groove with Abraham Lincoln’s head facing downwards.
- If you can see the top of Lincoln’s head, the tread depth is less than 2/32nds of an inch, and the tire is considered worn and unsafe for driving. In most states, this also means it’s below the minimum legal tread depth requirement.
- If the tread covers at least some portion of Lincoln’s head, the tire likely still has sufficient tread depth.
- It’s important to check the tread depth in several spots around each tire, as wear can be uneven.
- The quarter test is similar to the penny test, but uses a U.S. quarter and provides a slightly more conservative measurement.
- Insert the quarter into the tread groove with George Washington’s head facing downwards.
- If you can see the top of Washington’s head, it suggests the tread depth is below 4/32nds of an inch, [according to Discount Tire].
- While 2/32nds of an inch is the legal minimum, many safety experts recommend replacing tires when they reach 4/32nds of an inch, particularly for wet or winter driving conditions, [according to Matrack Inc.].
- Tire Tread Wear Indicator Bars: Many tires have built-in wear bars located in the tread grooves. When the tread wears down to the level of these bars, it indicates the tires have reached the minimum legal depth of 2/32″, [according to Michelin Tires].
- Tire Tread Depth Gauge: For a more accurate measurement, a tire tread depth gauge can be used. These inexpensive tools are available at most auto parts stores.
Remember, while coin tests and wear indicators offer a quick check, consulting with a qualified mechanic for a professional tire inspection is always recommended if you have concerns about your tire’s condition.
What coin should you use to check tire tread?
Great question! The penny test is an accurate way to measure whether tire tread depth surpasses or falls short of 2/32nds of an inch, since 2/32nds of an inch is the universally standard distance between the top of Lincoln’s head and the edge of the coin (see above for an explanation of how to do the test).
Can you check tire tread with a coin?
Down then stick your penny into multiple points of the tread across your tire to check for wear. If you can see the top of Lincoln’s. Head it’s time to get your tires checked by a professional.
What is the tread coin trick?
Insert a quarter into the tire tread upside down, with Washington’s head going in first.
If the top of George’s head is covered by the tread, your tires are OK – do this test at multiple points around each tire.
If the top of his head is visible at any point around the tire, you need new tires.
What is the quarter rule for tire tread?
The Quarter Tire Test
Another easy coin test is the quarter test. Insert a quarter into your tread groove. If the tread touches Washington’s head, you have at least 4/32 inch of tread remaining.