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Why Tire Tread Depth Matters for Road Safety

November 10, 2024 by Denver Express Car Care

What’s the most important car part to ensure safety? Seat belts? Airbags? Regular maintenance? 

Of course, you could argue for many different components. Thousands of parts work together to create the safest driving experience possible. 

But since we’re heading into winter, let’s talk about one of the most crucial aspects of road safety, something we rarely pay close attention to: tire tread depth. Your tires are the only part of your car that actually makes contact with the road, and the quality of that contact is determined by your tire tread.

Tire tread depth impacts your car’s traction, handling, and stopping power, especially in adverse weather conditions. (Like Colorado winters!) Over time, tread wears down, which reduces its ability to grip the road and keep you safe. Is your tire tread safe? Let’s learn more.

Why Tire Tread Depth Is Important for Safety

Tire tread is the rubber on the circumference of a tire that makes contact with the road. It’s that ribbed pattern on a tire’s surface, designed to “hug” the road in different road conditions. It moves water, snow, mud, and other debris out of the tire’s grooves, giving your vehicle more traction and increased safety. 

Why Tire Tread Depth Matters for Road Safety

Tread depth is simply the measurement of the grooves on your tires. Grooves make traction possible. They help the tires and your vehicle “stick” to the road. Without tread, you would have a smooth surface that simply glides across the road. Not good for safety. You need tread depth for:

Improved Traction

The tread on your tires helps them grip the road. When tread depth is too shallow, your tires lose traction, which increases your risk of skidding or sliding. Proper traction is particularly important when you’re driving in rain, snow, or ice, as it helps prevent hydroplaning.

Better Stopping Power

Tires with sufficient tread depth can stop more quickly and effectively. When your tread is worn, your car needs a longer distance to come to a complete stop, especially on wet or slippery surfaces. This increases the risk of rear-end collisions or other accidents when you need to brake suddenly.

Enhanced Stability and Handling

Good tread depth helps your tires maintain better contact with the road, giving you more control over steering and handling. Shallow tread reduces stability, making your car feel less responsive, particularly at higher speeds or around corners.

Resistance to Hydroplaning

The grooves in your tire tread channel water away from the tire, which helps prevent hydroplaning. Shallow tread can’t disperse water as effectively, increasing the risk of losing control in wet conditions.

How to Check Your Tire Tread Depth

How do you know if your tire tread depth is adequate? Luckily, it’s fairly easy to check. You don’t need specialized tools to do it, and you can do it quickly when you have a few minutes to spare.

The Penny Test

Have a penny in your pocket? Perform a tread test in seconds. Here’s how.

Take a penny and insert it into the tread groove with Lincoln’s head facing down.

If you can see the top of Lincoln’s head, your tread is 2/32 of an inch or less, which means it’s time to replace your tires.

If part of Lincoln’s head is covered, your tread depth is likely still safe. Just keep an eye on it.

Using a Tread Depth Gauge

Want a more precise measurement? You can use a tread depth gauge. These tools are inexpensive and can give you an accurate reading of your tire’s tread depth.

Insert the gauge into a tread groove and press until it reaches the bottom. The gauge will display a reading, typically in 32nds of an inch. If your tread is at or below 2/32 of an inch, it’s time to replace your tires.

Built-In Tread Wear Indicators

Many modern tires have built-in tread wear indicators—small raised bars that run across the grooves. These indicators provide a convenient visual cue that it’s time to replace your tires. When your tread wears down to the level of these bars, it’s time to consider new tires.

How Often Should You Check Your Tread Depth?

Depending on the tires you purchase, you can expect the estimated lifespan to be 50,000 to 75,000 miles or so. Of course, that depends on many different things, such as road conditions, how aggressively you drive your vehicle, and heavy loads. 

So tire tread depth isn’t something you need to check daily, but making it part of your routine can help you stay on top of tire health. 

Checking your tread depth once a month is a good habit, especially if you drive frequently or in challenging road conditions.

If you’re planning a road trip, it’s a smart idea to check your tread depth to ensure your tires are road-ready.

As the weather changes, tread depth becomes more critical. In winter, deeper tread is better for handling snow and ice, while summer driving also requires adequate tread for handling heat and rain.

When to Replace Your Tires

Even with regular care, tire tread wears down over time. It’s the price of owning a vehicle. Here are some things to watch for:

Tread Depth Is Below 2/32 of an Inch

The 2/32-inch rule is the guideline, but it’s often safer to replace your tires before reaching this limit, especially if you frequently drive in wet or snowy conditions. When you place new tires on your car, the tread depth typically ranges 10/32 or 11/32-inch. Anything above 6/32 is generally considered good tire depth. Many experts recommend replacing tires at 4/32 of an inch to maintain optimal safety.

Uneven Tread Wear

If one section of your tire wears down faster than the others, it could be a sign of misalignment or suspension issues. You can sometimes see this with a quick check. Uneven tread can reduce traction and compromise handling, so it’s best to replace tires with significant uneven wear.

Cracks, Bulges, or Cuts

Physical damage to your tires, such as cracks, cuts, or bulges, can weaken their structure and increase the risk of blowouts. If you notice any of these signs, it’s time to replace your tires to ensure safe driving.

Frequent Loss of Air Pressure

If you find yourself constantly refilling your tires, it could indicate a slow leak or general wear that affects their ability to hold air. Persistent air loss can be a sign that replacement is needed.

Tips to Preserve Tire Tread for Longer Life

Ready to purchase new tires? You want the longest lifespan possible, right? Here’s how to make that possible. 

Maintain Proper Tire Pressure

Underinflated or overinflated tires can lead to uneven wear. Check your tire pressure monthly and keep it within the manufacturer’s recommended range to ensure even tread wear and extend tire life.

Rotate Tires Regularly

Rotating your tires every 6,000 to 8,000 miles helps ensure even wear across all four tires, which maximizes tread life and keeps your car balanced on the road.

Align and Balance Tires

Misaligned or unbalanced tires can lead to uneven tread wear and cause your car to pull to one side. Regular alignments and balancing prevent this, giving your tires a longer lifespan.

Avoid Hard Stops and Accelerations

Fast acceleration and sudden stops put extra stress on your tires, leading to faster wear. Drive smoothly and avoid aggressive maneuvers to keep your tread intact.

Keep Tires Clean

Dirt, grime, and chemicals from the road can break down rubber over time. Regularly washing your tires can help protect them and reduce the buildup of damaging substances.

The Cost of Ignoring Tread Depth

Have you ignored tire tread depth in the past? It isn’t just a risk to your safety. 

Poor tread depth increases your chances of skidding or hydroplaning, which can lead to accidents. Tires with uneven or low tread wear unevenly, which can lower fuel efficiency and increase your gas costs. Driving on worn tires can damage your suspension and alignment, leading to expensive repairs down the line.

If you’re unsure about your tire tread or suspect it’s time for a replacement, bring your car to us. Our team of experts can inspect your tires, recommend the best options for replacement, and provide tips on how to keep them in top shape. Schedule an appointment today, and drive with confidence, knowing your tires are road-ready and safe!

Filed Under: Car Maintenance, Tires Tagged With: Tire Tread Depth

Tire Tread Depth

August 12, 2015 by Denver Express Car Care

Tire Tread DepthToday’s Express Car Care article discusses the effect of tire tread depth on braking.  When we talk about stopping power, drivers tend to focus on brakes.  But our tires are where the rubber meets the road.  So having good brakes isn’t always enough.  Every motorist has to have tires with enough traction to translate braking power into stopping power.

Let’s focus on stopping in wet weather conditions.  In order for a tire to have good contact with the road, it has to move the water out of the way.  If it can’t move the water, the tire will actually ride on top of the thin film of water.  This is called hydroplaning.  We want our customers to know that if you hydroplane you won’t be able to stop as fast and if it’s really bad, you can actually spin out of control.

So how does a tire move water?  It has channels for water to flow through.  Look at a tire and you’ll see channels that run around the tire and channels that flow across the tire.  They’re designed to direct water away from the tire so it can contact the road better.  These channels are called treads and the deeper the tread, the more water it can move.  A brand new tire has very deep channels or tread and can easily move a lot of water.  As the tire wears down, the tread becomes shallower and can move less water.  When it wears down enough, it can seriously affect your ability to stop on wet roads.

That is why it’s so important for drivers to replace the tires on their vehicles when they get worn.  Consumer Reports and other advocate groups call for a standard of 3/32 of an inch and have studies to prove it.

You might have seen the wear indicator that’s molded into tires.  When tires are worn 3/32 of an inch, the tread wear bar is visible.  So the recommended standard has twice the tread depth as a completely worn out tire.  This little bit of added tread makes a big difference in your stopping power.

If you’re curious about your tire tread depth, just insert a quarter into the tread.  Put it in upside down.  If the tread doesn’t cover George Washington’s hairline, it’s time to replace your tires.  We’ve recommended this before only using a penny, but the times have changed and a penny shows only half of the suggested amount for tire tread depth.

Give us a call of come in and see us if you have any more questions.

 

 

 

Filed Under: Tires Tagged With: Tire Tread Depth

Answers from Express Car Care: Tire Tread Depth

August 13, 2014 by Denver Express Car Care Leave a Comment

Question:

How can I tell when my tires are worn so much that they need to be replaced? Answers about Tire Tread Depth

Express Car Care Answer:

That is an important question for car owners.  As we discuss the matter, keep in mind that one of the essential jobs of your tire tread is to move water.  The channels in the tread act as passages for water to escape from underneath the tire.  The deeper the tread depth, the deeper the channel – and the more water that can be evacuated.

When enough water can’t be moved from underneath the tire, the tire can ride on the water – often called hydroplaning.  The tire is literally not contacting the road but rather is “floating” on the water, so there is little traction and the truck or car can slide.

So somewhere between a brand new tire and a bald tire lies the point at which the tire should be replaced.  Some governmental jurisdictions have a minimum tire tread depth requirement for auto owners – others do not.  So check the important laws where you live to learn the legal minimum.

Tire manufacturers are required to mold a tread wear bar into the tire.  This bar appears across the tread when the tire is worn down to 1.6mm ( 2/32 of an inch).  Drivers can easily do the quarter test ( they used to use a penny, but I guess inflation has affected everything).  Insert a quarter into one of the grooves with the caribou’s head pointing down.  If you can see the tip of the nose of this great northern animal, it is a sign of very worn treads.  That means it is high time to bid adieu to your tires.

Studies have shown, however, that there is an essential difference in stopping distances for auto owners in detrimental wet conditions with tires that have less wear.  For example, in controlled, wet conditions a vehicle with 3.18mm ( 4/32 of an inch) of tread traveling at expressway speeds was able to stop in about 85 feet ( 26 meters) less distance than the same car with tires with 1.6 mm ( 2/32 of an inch) of tread.  That could easily be the difference between a safe stop and hitting the vehicle in front of you.

New tires are a big ticket item for motorists so it’s natural to want to get as much value out of them as possible.  Just remember that a huge part of the value is the ability to stop safely in wet conditions.  You can speak with your Express Car Care technician for answers about tire replacement.

Filed Under: Tires Tagged With: Tire Tread Depth

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