How to Check Tire Tread Depth at Home

Maintaining healthy tires means not only watching how you drive but watching your tires’ tread depth on a regular basis. Knowing how long your tires have to go before replacing them can help you make proactive decisions about your vehicle’s performance. We’ll show you how you can check your tire tread depth at home, so you can make informed decisions about when to replace your tires.

Accurate Ways to Measure Tire Tread Depth Without Tools

There are some simple ways you can measure your tires’ tread depth at home. All you need is a U.S. penny or quarter and you can measure how much tread you have left on your tires.

Coin Method

The oldest trick to measuring your tires’ tread depth is the coin method. It’s super simple and can help you measure your tread depth, which is vital for vehicle safety and the longevity of your tires. If you turn a U.S. penny on its head, place it in the center tread groove and you can see all of Abraham Lincoln’s head, that means your tire tread depth is 2/32”. That is the legal limit a tire tread should be, so that is a huge red flag telling you to swap out those tires with a fresh set.

You can also use a quarter to measure whether your tire tread is 4/32”. If you can see all of George Washington’s head, your tire tread is at or below 4/32”. This is a good way to gauge your tire’s lifespan, the more visible the quarter becomes the less tread depth you have. We also recommend this is the point where you start planning on replacing your tires in the near future, because the smaller the tread depth, the lower the tire can perform.

Tread Wear Bars

Another way to determine your tires need to be replaced is the tread wear bars. These bars are small, raised fixtures in the tread grooves that only become visible when the tires reach 2/32”. The easier they are to see, the less tread you have left. If they are clearly showing on your tire, you should replace them as soon as you can.

Minimum Legal Tread Depth for Passenger and Truck Tires

For car and SUV tires, the minimum legal tread depth is 2/32 inches. This is not the recommended minimum, this is the absolute minimum depth for your tire treads. It can be unsafe to drive beneath this level, so you will need to replace your tires that are 2/32” in depth. We recommend you replace your tires once they reach 4/32” or fall below this level for optimal traction and performance.

Penny Test vs Tread Gauge: Which Is More Reliable?

We explain the penny test above, and it’s a quick and easy way to determine your tread depth, but it’s not as accurate of a measurement tool as using a tread gauge which can give you more nuance into how your tire has degraded over time, allowing you to be more proactive in knowing how long your tires will last and when you can expect to replace them.

With a tread gauge, you can measure your tread depth from when you get new tires and see how much they wear down over time to gauge your tires’ life expectancy. If you need your tires to perform for longer, we recommend using a tread gauge to keep track, otherwise using the coin method can give you a good estimate of when you should replace your tires.

How Tire Tread Impacts Hydroplaning Resistance

The higher your tire’s tread depth, the better it will perform in wet conditions. If you drive in wet conditions regularly, you should know your tire tread depth and monitor it for improved safety.

Hydroplaning happens when the tires cannot separate the water fast enough to reach the driving surface. What helps reduce the risk of hydroplaning is tread depth. The longer the treads means the more grooves can channel water away from the tire for better traction. When the tire cannot make contact with the road, the thin layer of water will cause the tires to slip, reducing the driver’s control over the vehicle.

That is why we recommend keeping your tire tread at or above 4/32”. Going below this level will decrease tire performance and increase the risk of hydroplaning for drivers traveling through wet road conditions.