When it comes to checking tire tread, there are a number of methods that can help you know if it’s time to replace a tire. Heavily worn tread will prevent a tire from performing as designed and can lead to unsafe driving conditions. One of the simplest, most common ways to check tread depth requires nothing more than a penny and a few moments of your time.
In the United States, tire tread depth is measured in 32nds of an inch. New tires typically come with 10/32” or 11/32” tread depths, and some truck, SUV and winter tires may have deeper tread depths than other models. The U.S. Department of Transportation recommends replacing tires when they reach 2/32”, and many states legally require tires to be replaced at this depth.
The idea of the penny test is to check whether you’ve hit the 2/32” threshold. Here’s how it works:
Place a penny between the tread ribs on your tire. A “rib” refers to the raised portion of tread that spans the circumference of your tire. Tire tread is composed of several ribs.
Turn the penny so that Lincoln’s head points down into the tread.
See if the top of his head disappears between the ribs. If it does, your tread is still above 2/32” , If you can see his entire head, it may be time to replace the tire because your tread is no longer deep enough.
When performing the penny tire test, remember not only to check each tire, but to check various places around each tire. Pay special attention to areas that look the most worn. Even if parts of your tread are deeper than 2/32”, you should still replace the tire when any areas fail the penny test.
Consistent wear around the whole tire is normal, but uneven tread wear could be a sign of improper inflation, wheel misalignment, or a variety of other things. If you see uneven tread wear, you should have a technician inspect your vehicle.
A simple way to check your tire tread depth is by using a tread depth gauge.
You can find tire tread depth gauges at your local auto parts store. There are many models available, but an inexpensive simple graduated probe gauge will work just fine. All you have to do is stick the probe into a groove in the tread and press the shoulders of the probe flat against the tread block and read the result. All gauges should measure in both 32nds of an inch and millimeters.
Another indicator of worn out tread already lives in your tires themselves. Every performance, light truck, or medium commercial tire comes equipped with indicator bars (or wear bars) embedded between the tread ribs at 2/32”. They’re there to help you monitor tread depth and make decisions about tire replacement. Just look to see if the tread is flush with the indicator bars. If they are, it’s time to replace the tire.
While the penny tire test does deliver on what it promises – indicating whether tread has reached the legal limit – it may not be the best indicator of whether your tires are safe for the road.
Tire performance can diminish significantly before your tread hits 2/32”. Even though the law deems fit for safe driving may not prevent you from hydroplaning or losing control in rainy, slushy conditions. If you think your tires may be close to needing replacement, have them checked out by a licensed mechanic.
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With this easy test, a penny can buy you peace of mind when it comes to your tires and safety.
Place a penny head first into several tread grooves across the tire. If you always see the top of Lincoln’s head, your treads are shallow and worn. If this is the case, your tires need to be replaced.
If part of Lincoln’s head is always covered by the tread, you have more than 2/32 of an inch of tread depth remaining. This means you probably don’t need new tires.
When your tire treads are worn, your car may respond poorly in adverse weather conditions like rain and snow. With good treads, your car will grip the road better. Also, having insufficient tread is considered illegal in many states. And finally, worn treads can make other parts of your car wear prematurely.
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When it’s time to change your tires, your Firestone Complete Auto Care dealer wants to make purchasing a new set as simple as possible.
We have the best selection of quality tires to fit your vehicle, your budget and your driving style. From economy to ultra high performance tires - in the size you need from brands you trust, including our well-known Bridgestone and Firestone brands - you can find what you need right here.
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Irina Zverkova
Estimated reading time: 4 minutes
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RIA Novosti
Tires are one of the most important components of a vehicle to ensure driving safety. Proper use of summer and winter tires during the season improves handling and saves the car owner money. But some drivers not only postpone changing tires depending on the weather, but also continue to use the same tires for several seasons. At the same time, wheel wear becomes more and more, and the threat that the tires will not cope with holding the car increases.
The tire tread is responsible for connecting the car to the road.
This is the outer layer of rubber, which contains a certain pattern, suitable for different operating conditions. For summer tires, the removal of water from the contact patch is relevant, for winter tires - improved grip on slippery surfaces, for off-road tires - maximum cross-country ability. Regardless of the purpose of the tire, one of the important characteristics of the tread is its height or depth. This is the distance from the outer edge of the tire to the "bottom" of the groove. For new modern car tires, the height starts from 5 mm. For ordinary summer passenger tires, this value is 6–8 mm, for winter tires it is 8–10 mm, for SUVs it is 15–20 mm.
When the tread wears out (decrease in its depth), the driving properties first of all suffer: the car is more prone to aquaplaning. Winter tires lose some of their properties, which are provided by special sipes and studs. It is important to consider that different brands and models have different rubber composition, so some wheels “run” longer.
The driving style also affects wear - more aggressive starts and active braking shorten the life of the tire.
9 is considered critical for tire wear0022 tread height of 1.6 mm for summer tires and 4 mm for winter .
Height can be measured using the ruler with the depth gauge or vernier caliper.
Those who do not have such tools can use a regular 10-kopeck coin placed in one of the grooves. If the word "kopecks" is hidden, it means that the tire is almost new and does not require replacement. If the tread covers only the floral ornament on the winter tire, then it will soon need to be changed; if it’s in the summer, the replacement will have to wait. If only the rim of the coin is hidden, you need to urgently install new tires.
On the left is a worn tire, on the right is a nearly new tire. Photo: AiF / Irina Zverkova Many modern manufacturers make wear indicator on tires (this is a protrusion perpendicular to the axis of rotation of the tire) or lay a special colored layer that becomes visible when the tire is erased.
Their manifestation serves as a signal for the car owner to change tires.
It is important to monitor not only the tread depth, but also the wear uniformity . To be sure that the wheel is in good condition, it is better to measure the tread depth at different places around the circumference along the entire width of the tire. If the inner or outer part is worn out more, then the wear of the tread is taken into account at a minimum value, and it is better for the owner to check the wheel alignment / collapse of the car.
If the vehicle has frequently been driven on bumpy roads, climbed curbs, or the tires have been run half-flat, the sidewalls may have dents, holes, cuts or cracks . It is better to check their condition at the tire shop before the wheel is flat at the most inopportune moment. For example, it may not withstand the loads in a turn, burst and provoke an emergency. You should be especially careful about such damage on low-profile tires.
On average, tires last about 6 seasons , after which it is better to replace them. Improper storage and aggressive riding can shorten the lifespan. You also need to pay attention to the expiration date of the tire and the date of its production when buying, because polymers, unlike metal, can break down and lose their properties over time.
If it is not possible to update all four tires, then, as a last resort, you can put new rubber on the drive wheels. But needs to be changed exactly a pair of , otherwise the vehicle's handling may be severely impaired.
See also: When to change tires to summer tires →
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Media news2
Tires are not the first freshness. As absurd as it may sound, the question of the release date of tires worries some buyers.
In garages and tire shops, they answer the question in completely different ways - does the year of rubber production affect the quality of the tire? To be honest, probably not. Let's figure it out.
How to determine the year of manufacture of tires? The manufacturer indicates the week and year of manufacture on the tire on the inner circle near the bead ring. 4 numbers in an oval - what we are looking for. For example, 4317 means that the tires left the assembly line in week 43 of 2017. It turns out, around October. In accordance with standards and common sense, you can absolutely safely buy new tires that were released 3-4 years ago. The manufacturer sets a warranty period. Usually it is 5 years. The service life can be much longer.
Yes, many tire manufacturers have tested new tires on par with 3 year olds at their test centers. Michelin's 2018 study received the biggest response. Rubber was tested in Asia, Europe and proved that new and three-year tires are one and the same.
The result of the experiment was the advertising campaign “Tyres are not bananas” and the conclusions: three-year-old tires from the warehouse are no different from new ones, and the real life of high-quality tires is up to 10 years from the date of production.
Right. And in their research, Michelin experts spoke only about their tires, subject to strict adherence to the rules for long-term storage. In our country, everyone is guided by the norms and recommendations of GOST. It regulates the period during which the manifestation of defects is excluded - 5 years. During this period, they are considered new and are subject to sale in the usual way.
A visual inspection is sufficient for this. For example, you decide to buy tires in Yekaterinburg or Nizhny Tagil. And you are offered four-year tires, explaining this by the total supply of such a batch to the Urals.
Examine each carefully. The main beacons are surface integrity and color.
1. Exclude the presence of microcracks, even single ones - this is an indicator that the rubber has begun to dry for some reason.
2. The color of the tires should be a rich black, without whitish streaks and faded areas.
3. If you really want to, you can try on the wheel at the tire shop at the store. Rubber should remain intact, not give microcracks and require standard balancing.
In 99 cases out of 100, this is exactly what will happen. A quality tire may not show signs of aging after 5 years of proper storage. This is only possible with manufacturing defects.
No one has done exact research, but marketing is most likely to blame. In order to stimulate sales of new tires, it is logical to convince the client that it is dangerous to ride on old tires.
Yes.
