A Helpful Q&A Guide to Buying Tires
A lot of people choose tires based on the mileage warranty and cost. However, these are only two of many important factors to consider.
There are lots of choices between tires even at the same mileage and price point. It’s important to understand key factors to have the right tire for your driving needs. Things to ask about are: tire size, performance rating, load rating, ply rating, expected mileage and tread design, so you can depend on your tires and feel safe while traveling.
Here are answers to questions people ask the most about how to pick out tires. This info won’t make you a tire expert but will give you the basics when you visit your tire dealer.
Q: Do I Want All-season or Snow Tires?
A: It depends on whether you drive in winter conditions regularly.
Tires are categorized as all-season, summer, traction, winter or highway (for light trucks). Buying a set of highway or all-season tires is a good choice if you live in a sunny, warm climate that gets occasional rain and you aren’t regularly traveling on snow and ice. They perform well in climates where temperatures don’t typically get below 45 degrees. All-season tires are built to handle hot pavement but don’t offer the traction needed for slick, winter roads. If your area gets snow or ice every year, or if you make regular trips over mountain passes in the winter months, you’ll likely need all-season tires for spring, summer and fall driving, and snow tires for more harsh conditions. Get the full lowdown on how they’re different and how to choose winter tires.
Q: Do I Want Performance Tires?
A: Performance tires are designed for better cornering and handling at higher speeds. If these are your priorities, talk to your tire dealer about your options.
Other specialty tires, such as traction tires for pickups and SUVs, are for off-roading, gravel and driving in mud.
Sometimes your demands are simple; you just need a quiet, smooth passenger car tire for freeway driving. All-season or all-terrain tires are made to handle year-round driving needs on and off the blacktop. A good tire dealer will ask you the right questions and know the best product for your needs and budget.
Q: Does Driving Winter Tires in Summer Damage Them?
A: Yes. With more people running studless winter tires, this is a growing issue. Winter tires are made with a special rubber compound that stays softer and more pliable in cold weather for better road grip. As seasonal tires, they aren’t designed to handle the heat. All-season tires are made with a different rubber compound suitable for hot pavement.
If you use winter tires in hot weather they are going to wear out much quicker. It’s important to factor in the long-term cost if you’re thinking about running your winter tires through the warm months. This could reduce their life by years.
Q: Is There Really a Difference Between Higher- and Lower-priced Tires?
Tire pricing is typically based on what the tire delivers for comfort, ride quality, noise level, tread durability and traction features. Some tires for specific uses. For instance, light truck mud tires may have a higher price point because they have more rubber on them, which increases the cost to produce them. Prices also reflect the value you can expect from your tire; tread life typically ranges from 30,000 to 80,000 miles. This mileage can vary depending on whether you are looking at passenger car, performance car, light truck or SUV tires.
Q: Who Makes the Best Tires?
A: There are plenty of well-made tires. The biggest differences often come down to the warranty. Most of what you get in a tire warranty is provided by the dealer, not the tire maker. If there’s a defect in the tire you buy, that’s covered by the manufacturer. However, many other warranty features are covered by the dealer that sold and installed your tires.
Tire service warranties vary greatly by dealer and can be worth hundreds of dollars over the life of a tire. A well-built tire is only as good as the warranty backing it, so consider everything that’s in the warranty. Here’s a list of what to look for:
- Length of coverage. The best warranties extend for the full life of the tire’s tread mileage guarantee, not a set number of years.
- Workmanship. Both the tire and the quality of installation/repairs should be covered.
- Free care. Whether flat repairs, regular inspections for wear, tire rotations and rebalancing are free.
- Road hazard coverage. If you hit debris or a pothole and the tire is damaged beyond repair, is the value of the tire covered?
- Convenience. How many locations honor the warranty.
Be careful about buying extended tire coverage, like tire certificates, which replace your tires for free if you ruin them. It’s very rare to damage multiple tires beyond repair over the life of the tires. Usually, damage to a tire can be repaired and often it’s a single tire that’s involved. By the time you add up the cost of covering your tires with certificates, you could pay for any tire that gets damaged.
There are other drawbacks as well. Tire replacement certificates often expire after three years. And some aren’t honored if the damage comes from running your tires at the improper inflation.
Q: Can I Change My Tire Size?
A: Swapping out your tires for bigger or smaller ones than what came new on your vehicle is a fun way to change your ride’s look. Understand that it may affect performance. Be aware that when you change to a taller tire, your speedometer will read slower than you’re going because your tire is spinning fewer revolutions per mile (RPM). You may get more road noise and differences in the way your vehicle handles.
In contrast, lowering the profile of your car or truck by using a smaller tire size will alter both handling and how much clearance you have. You may bottom out on hills that you used to clear just fine and it may stiffen the ride.
You can use a tire size calculator to see how different sized tires will affect your RPMs and tire speed, but such tools are only estimates.
Be sure to cover all the unknowns by talking with a tire professional before you change sidewall height or tread width. An expert will know how to translate the difference in RPM, tire speed, load index and speed rating into what it will mean for your vehicle and driving. They’ll also explain how the tires or wheels you have your eye on will or won’t fit with your vehicle’s suspension, gearing and bodywork.
Q: Is It Ok to Replace One Tire at a Time?
A: It’s best to consider replacing tires in pairs, but read your owner’s manual. Even small size and type differences between your four tires can have big consequences, especially if you own an all-wheel drive (AWD).
Replacing one tire with a different brand, model, size or tread depth can cause a noticeable pull in the steering wheel or other handling issues. There are tight tolerances for AWDs, so they’re at greater risk for such problems.
A big difference in tread depth between tires can damage expensive parts. It is always a good idea to review your owner’s manual to see if the vehicle manufacturer has a point of view on this.
Q: Will Buying Tires Online Save Me Money?
A: It might save you some money if you’re a tire expert and have a place that will mount the tires on your wheels. If not and you don’t, you run the risk of getting the wrong type of tires for your vehicle and driving. Then that Internet bargain can add up to a lot more hassle, time and money than expected.
Another issue is finding a tire dealer that will service your tires by mounting and balancing them on your wheels at a reasonable cost. This can get expensive if you’re changing out summer and winter tires twice a year. Here are some cost and warranty factors to consider when you’re thinking of buying online.
5 Questions Any Good Tire Dealer Should Ask
Tires are a big investment most people make only every few years. If you want to make the right decision, you’ve got two choices:
- Become a tire selection expert.
- Become a tire dealer selection expert.
Option 2 is a lot easier. Make sure the salesperson asks you these five questions:
1. “What do you use your vehicle for?”
The best tire for a commuter in an economy car may not be the same as what’s needed for the family car. The tire that’s best for comfort and least noise for your long-distance commute may be overkill for a third car that's used less often. If you’re hauling loads or a trailer with your truck, that suggests a different choice than what’s right on a truck used for lighter duty.
Road conditions are a part of this equation. If you regularly go off-road, you’re driving streets with lots of potholes, or you live in a place with winding roads and tight curves, the salesperson’s recommendations will differ.
2. “What are your driving habits?”
If your dealer asks this question, they’re a keeper.
Literally and figuratively, tires aren’t one-size-fits-all. For example, a new driver in the family can change the ideal tire. So can your tendency towards conservative versus faster driving.
3. “Will you be doing any driving in winter conditions?”
You need tires that suit the weather conditions where you drive and your dealer knows that. A good one will ask.
All season tires are the choice for drivers in sunnier places. If you’re driving on snow or ice every year, you’ll likely have winter tires for cold months and a different set for warmer weather. Your dealer’s recommendation on what’s going to last longest and perform best will also be different if you live in a place with extremes of heat and cold than someplace with more consistent weather.
4. “What’s your budget?”
All these factors — driving habits, safety, longevity, comfort, handling, noise — have to be balanced with your budget. A good dealer is happy to explain the differences between a quality, basic tire, a premium tire, and everything in between, because it narrows the choices to what's best for you. You should never get the feeling the store rep is pushing a tire just because it’s on sale or it’s the most expensive.
5. “Here’s how our warranty works …”
OK, it’s not really a question. But the best dealers will bring this up. If you want to get the best value for the money, it’s really important to think this through. Service warranties can include free services worth hundreds of dollars over the life a tire. They vary substantially by dealer. Some features and limitations to find out about:
- Road hazards: If you run over a pothole, nail, or debris that damages the tire beyond repair, is the value of the tire covered?
- Expiration: How long is the tire covered? Three years? Five years? The life of the tire?
- Workmanship: Are both the tire and the quality of installation/repairs covered?
- Free services: Are regular inspections for wear, tire rotations and rebalancing included? What’s the cost to fix flats?
- Locations: How many stores will honor the warranty? The service warranty that comes with tires you buy at a dealer is an agreement with the dealer, not the manufacturer. A service warranty goes beyond the standard workmanship and material warranty you get from the company that made your tires. It can cover labor and free maintenance services. But your service warranty is good only at the retailer that sold you the tires. (If you’re weighing buying online, consider that if you get a flat, or a tire is defective, you have to get it off your vehicle and return it yourself.)
Find the right dealer and you don’t have to become a tire expert
Real professionals will be happy to talk your ear off about technical features — tread bars, siping, harmonic noise — or just give you the basic benefits of a tire in layperson’s language, your preference. Make sure they’re asking the questions above as a starting point. The answers will make the best choice obvious.
How Do I Check My Tire Pressure?
Low tire pressure can be an expensive proposition, costing you hundreds of dollars a year in lost fuel economy and prematurely worn tires. Add to that, decreased handling and an increased risk in tire failure, and it’s easy to understand why maintaining proper tire pressure is so important. Tires naturally lose 1 to 2 pounds of pressure a month. Cool temperatures cause even more pressure loss. So it’s important to check your vehicle’s tire pressure regularly.
We recommend you check your tire pressure at least once a month or twice a month in the winter.
Using an Air Pressure Gauge
Here’s how you go about it with an air pressure gauge, can be found at most any auto parts store.
First, look in the owner’s manual or on the inside placard of the driver’s side door for the standard cold tire inflation pressure. This number is the PSI, or Pounds Per Square Inch, you will inflate your tires to, as suggested by the car’s manufacturer.
Next, unscrew the cap from the valve stem on the tire.
Now, press the air pressure gauge onto the valve stem and record the reading given. If there’s a hissing sound, try re-seating the gauge for a tighter fit and more accurate reading. Note that if the reading on all four tires is the same as the manual’s specifications, you’re done. If any of the tires have inadequate pressure, add air until they’re properly filled. Make sure you put in the correct amount by rechecking the pressure in each tire after refilling.
Finally, replace the valve stem cap to protect the valve mechanism from dirt and moisture.
While you’re at it, check the pressure on your spare tire, as well. You never know when you might need it.
Follow along as we show you how in this video:
Or you can simply stop by your nearest Les Schwab Tire Center, where we not only check tire pressure for you but also adjust it, if necessary. Free of charge.
Have any questions about tire pressure? One of our experts will be happy to help.
Are Nitrogen-filled Tires Worth the Cost?
The main benefit of nitrogen-filled tires is that the loss of tire pressure is slower, because the gas in the tire escapes more slowly than air does. With more stable tire pressure, the thinking goes, you’ll get better gas mileage and get full tire life since you’re always rolling on fully inflated tires.
Claims are also made that nitrogen in tires prevents tire “rot” by limiting the moisture that naturally occurs inside tires and heads off corrosion of the wheel that can be caused by contact with moisture.
These claims are overstated. The advantages of tires filled with nitrogen, instead of plain ol’ air, aren’t big enough to justify the price tag or the inconvenience. On new car tires, the cost can range from $70 to as much as $179. On existing tires, you’ll pay up to $30 per tire for service to drain air and refill with N2. Refills will run you $5 to $7 per tire, which you can expect to do less often than with air-filled tires. But you’ll still need topping off every two or three months.
The Science of Putting Nitrogen in Tires
Small amounts of air naturally leak out of tires over time, especially when tires are subject to large temperature swings. This is because the walls of tires are slightly porous. When a tire gets hot the air inside it expands. The added pressure pushes minute quantities of air out through the pores, so you occasionally have to get your air topped off even if your tire doesn’t have a hole.
Promoters of nitrogen tires point out they don’t lose tire pressure as fast as air-filled tires. Since nitrogen molecules are bigger than normal air molecules, it is harder for them to leak out. This means a tire filled with nitrogen will maintain air pressure longer. Therefore, they say, you’ll roll on tires that are always properly inflated, resulting in better fuel economy and longer tire life.
A normal tire filled with regular air loses an average 1 to 2 PSI (pounds per square inch) per month. It’s true that there is a slower loss from nitrogen-filled tires. But this improvement is slight — only about 1.3 PSI less over the course of an entire year, according to Consumer Reports. It’s not enough to make a true difference in gas mileage or tire wear for people driving passenger vehicles.
This is partly because air is already made up of 78 percent nitrogen and just under 21 percent oxygen, with the rest a mix of water vapor, carbon dioxide and other gases. When tires are filled from a nitrogen air pump this ups the percentage of N2 to between 93 and 95 percent. It’s never 100 percent.
Bottom line: Nitrogen will slow the amount of tire inflation loss to about one-third of what you’ll experience with air. This means instead of losing one to two PSI per month, you’ll lose ⅓ to ⅔ PSI per month. You’ll still need to check and top off your air roughly every other month to stay within the ideal inflation range. And you’ll spend far more than you’ll save on gas and tire tread life. You’re better off making simple tire maintenance part of your routine.
Go Ahead and Do It If:
- Your ride is a racecar. Nitrogen is used to fill tires for track cars, since it does offer the advantage of more consistent pressure.
- You’re buying a new car with new tires that are being filled for the first time, you live close to a nitrogen filling tank, you have disposable income to spare and you never check your air pressure.
Nitrogen-filled Tires FAQ
There are more cons than pros for changing to N2 tires. For example, nitrogen filling tanks aren’t easily accessible like air compressor tanks. You’ll have to plan for refills in places that may be few and far between. This can cost you time and money. Here’s all the info.
Q. How much will it cost to get nitrogen in my tires?
A. For fills of new tires, between $70 to about $175 at some outlets. Drains of air and refills with nitrogen on current tires, up to $30 per tire. Topping off can be between $5 and $7 per tire. If you want to keep your tires within 1 PSI of the ideal, you’ll likely be topping off at least four times a year, probably more. This could be between $80 and $112 a year, and possibly a whole lot more. Compare this to paying nothing at all for regular air at a tire store, or around a buck per fill at a service station.
Q. Are they safe?
A. They’re as safe as regular tires. Nitrogen isn’t flammable and won’t cause your tires to explode.
Q. Will I get better gas mileage?
A. You’ll always get better fuel economy on properly inflated tires, whether they’re filled with nitrogen or air. Under-inflated tires can lower gas mileage by about 0.2% for every 1 PSI drop in the average pressure of all tires. They’ll also wear faster and be more prone to failure. The most economical way to make sure you’re driving on well-inflated tires is to just check your tire pressure once a month or get it done by a technician (free at good tire stores).
Q. Will nitrogen prevent tire rot? Wheel rust?
A. Nitrogen is a “dry” gas compared to oxygen (which makes up about one-fifth of regular air). Nitrogen-filled tires don’t generate as much moisture inside when tires expand from heat friction then contract when they cool.
However, rubber rot from moisture inside the tires of passenger vehicles is very unusual. Unless your tires are on a vehicle that’s rarely driven, it’s far more likely your tire tread will wear out before the small amount of moisture inside an air-filled tire degrades the rubber.
And today’s alloy wheels are coated to prevent corrosion on steel parts — the belts, beads and sidewall buttressing — that may come into contact with water, so that’s not a typical problem.
Q. Can nitrogen tires be filled with air?
A. Yes. It’s unsafe to drive around on under-inflated tires, so don’t hold off thinking you need to wait to top off until you can get to a filling tank. It’s perfectly fine to add air and just get your next fill with nitrogen.
Q. Do they run cooler?
A. There’s no significant difference between air-filled and nitrogen-filled tires in terms of running temperature.
Q. Where can I fill my tires?
A. Use this nitrogen dealer locator, but be aware that some filling stations require you to have purchased tires with them, or have a membership.
Q. Will I have a better ride?
A. There’s no difference in handling or ride quality between tires filled with air or nitrogen, so long as they’re kept properly inflated.
Q. How can I tell if I have nitrogen in my tires?
A. The tire valve stem will have a green plastic cap or a cap topped with a green indicator.
Q. How do tires get filled with nitrogen for the first time?
A. The tire is purged of air and filled with nitrogen several times using a machine, which takes out most of the oxygen along with any water.
Tire Size Calculator: What Size Tires Should You Get?
If you’re considering swapping out your tires for a different size and want a sense of what might work for your vehicle, use our tire size calculator.
How to Figure Out Tire Size
Our tire size calculator converts metric measurements to inches so you can easily compare the diameter, width, sidewall, circumference and revolutions per mile. It will also tell you the difference in tire speed between your comparison tires.
As a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires’ diameter — assuming your current tires are what your owner’s manual recommends.
A Note on Accuracy
Our tire size calculator is for general comparison purposes only. We don’t recommend that you base sizing or purchase decisions on the calculator alone. A tire’s true physical size can vary from the dimensions provided by the tire manufacturer, and this tool does not take into account other important application factors like load index and speed rating. These calculations (and those provided by all online tire dimension calculators) don’t account for these variations. The way to be sure your tires are the right fit is to ask your local Les Schwab pro.
Tire Tread and the Useful Penny Test
Anyone who drives a car knows what tire tread is. But do you know how to tell whether it’s wearing thin?
Worn out tires affect your car’s performance and your safety. Luckily, there's a simple way to check your tires with just your pocket change.
Measuring Tread Depth With the Penny Test
A new car tire typically has a tread depth of 10⁄32 or 11⁄32 inches while a light truck will have between 11⁄32 and 19⁄32 inches. The U.S. Department of Transportation recommends that you replace your tires once they’ve worn down to 2⁄32 inches. Many states require tires to be replaced when the tread reaches that depth.
How do you know when your tires are officially worn out? You can use a tread depth gauge or take your car in for a professional evaluation. But the easiest way is to do a penny test.
- Take a penny and place it with Lincoln’s head upside down between two ribs on your tire.
- If part of the head is covered, your tires are still in good shape.
- If you can see his entire head, your tread is worn to 2⁄32 inch or less and it’s time for new tires.
- Check various points on the tire — around the circumference and between different ribs — to look for uneven tire wear.
Many car and truck tires come with indicator bars at 2⁄32 inch. If these are even with your tread ribs, you’ll know your tires need to be replaced.
Now you can measure your tread, but you may not know about all its components or what different tread patterns are for. The more you know about types of tread, the easier it will be for you to choose the best tires for your vehicle. Here are some facts to beef up your tire knowledge.
What Is Tire Tread?
There are four (sometimes five) main components to tire tread:
- Ribs: The long, raised bands that go all the way around a tire.
- Blocks or lugs: The raised segments between ribs.
- Grooves: The space between ribs.
- Voids: The space between tread blocks.
- Sipes (sometimes): Thin slits cut across the tread blocks and ribs.
Ribs and tread blocks make contact with the pavement, while grooves and voids channel water when roads are wet and allow the blocks to flex as tires grip the road.
Siping is designed to improve tire performance during wet and winter driving conditions.
Different tire manufacturers combine these features to create signature designs and offer good performance for a range of driving conditions.
Types of Tire Tread Patterns
Though each tire manufacturer makes unique variations on tire tread, the patterns generally fall into three categories. Each pattern provides different handling and performance.
- Symmetric designs, as the name suggests, have the same pattern across the whole tire. This is the most common tread pattern for passenger cars.
- Directional tread patterns include lateral voids pointing in only one direction, making a V design, and are used on performance cars (those designed for speed). These tires channel water in one direction for reliable handling in wet conditions and provide zippy handling on dry roads.
- Asymmetric designs combine the above two patterns to offer good grip on dry roads as well as traction in wet and winter conditions. The inner side of the tire often features lateral voids like those found in directional tires, while the outer side uses larger tread blocks.
Summer tires and winter tires both generally have a symmetric design, with winter tires sporting deeper tread depth and sipes. Asymmetric patterns are often a good choice for all-season tires.
Safety Risks of Worn Tires
Though tires are considered bald at 2⁄32 inch, they lose some of their performance capabilities before that.
As tire tread wears, it becomes less able to channel water and the risk of hydroplaning increases, especially at higher speeds. If you know your tires are partly worn, be sure to give yourself extra stopping distance in wet conditions.
Grip loss on snowy or icy roads is a concern. As the rubber wears, sipes disappear and tread blocks don't provide as much grip. Again, allow yourself more stopping distance and consider replacing your tires to stay safe during winter months.
Tires with partly worn tread are more likely to get punctures and lose air pressure, too. And punctures can cause tire failure, which is a particular problem at high speeds because you can lose control of your vehicle.
Drive on Safely
A penny test will tell you when your tires are bald, but if you’re headed into winter or a rainy season, a tread depth gauge is the surest way to test. Or stop by your local tire shop to have a professional evaluate your tires.
Can I Mix Run-flat Tires with Standard Ones?
You’ll have safer handling and prevent damage to other parts of your car when all four tires on your vehicle match closely in type, tread depth and size. This is not the case when you mix and match run-flat tires with standard tires. Here’s why.
Run-flat tires (RFTs) are built with reinforced sidewalls, which make them a lot stiffer. This is why they can be driven between 50 and 100 miles (depending on the type) at about 50 mph with low or no air.
When there’s a big difference between your front and rear tires’ sidewall flex, your car’s handling will be imbalanced. You won’t have proper stability, especially when you need it most: around corners, at highway speeds and when swerving.
Due to the way they’re made, RFTs typically wear out long before standard tires. If you mix and match, you may end up with significant differences in tire tread depth between your front and rear axles. This could result in other problems if you replace only the two worn-out tires.
Consider costs, repairability, and convenience if you’re thinking about getting or ditching RFTs.
RFTs (also called zero-pressure tires) come standard on about 12 percent of new vehicles. You can expect to pay more for them than regular tires. That’s not the only expense to factor in:
- You’ll be replacing them sooner. RFTs wear out an average of 6,000 miles before standard tires.
- While some manufacturers say it may be OK to repair RFTs in some circumstances, driving any distance on a flat RFT can damage the internal construction of the tire. No type of tire should be run when it is very low on air pressure. You’ll not only ruin the tire but risk damage to the wheel.
- It’s a misperception that RFTs can be driven flat and still be usable. You’re looking at buying a new tire whenever you drive on a tire with zero air in it. A single flat can, therefore, start adding up in cost.
Can a Run-Flat Tire Be Patched?
Some may be repairable in limited circumstances: It’s a simple, small puncture in certain parts of the tire, you didn’t lose a whole lot of air and no internal damage is done.
The tire technician should inspect the exterior for severe shoulder wear and sidewall scuffing. The tire should be unmounted and the interior checked for puncture size, possible bead problems or other damage. Driving with really low air generates a lot of tire heat which can destroy the rubber and plies. It can be difficult to detect such internal damage. Any of these indicators likely mean the tire isn’t fixable.
If a repair is possible, check to be sure that the tech doing the repair has the specialized equipment and certification to do it right. The shop should use a rim-clamp-style mounting machine to put the tire back on and take care not to damage TPMS sensors.
Be aware that once an RFT has been repaired it may void all other aspects of the warranty.
Are They Really More Convenient?
If you simply must avoid ever changing a flat tire and you live someplace where you’re always within 50 miles of a service station, run-flats may be an option to consider. But the conveniences of zero-pressure tires are very limited.
If you hit some large debris or the tire suffers damage to the sidewall, you’re going to be stranded. RFTs cannot roll at all when the sidewall structure is compromised.
And when it comes time to get one replaced, they may be hard to find. They’re specialty tires. You may be waiting for a replacement.
Run-Flat Tires or Not?
RFTs offer some convenience and quick steering response. You can get safely off a busy freeway when you have a flat or skip changing a tire in the cold rain. If one suddenly deflates, you’ll have more stability when steering through the tire failure.
But some drivers find them noisy and stiff-riding. They cost more, especially if you end up with a flat. They don’t last as long as standard tires. Since RFTs won’t visibly sag if the air is low, it’s especially important to maintain correct pressure and be sure that the TPMS system is working at all times.
If you have a roadside assistance plan as part of your auto insurance or with AAA, evaluate whether it may be cheaper and more convenient to buy traditional tires and rely on a tow in case you get a flat. (And consider whether it may be better to carry a spare.) If you decide you want to replace the run-flats that came on your car with standard tires, it’s perfectly fine to mount them on your existing wheels. They’ll fit properly so as long as they’re the same size.
When Your Flat Tire May Need to Be Replaced
It’s easy to learn how to change a flat tire and install your spare. What’s not as easy is knowing when your flat tire can’t be repaired or patched, and when it will need to be replaced with a new tire. Here are 8 indicators you may need a new tire.
- The tire has a sudden loss of air and you drive on it flat. This can cause internal damage, which can’t be fixed.
- The sidewall has a puncture, a cut exposing the cord, or a visible bubble or bulge.
- The shoulder has damage (more than cosmetic), such as a small puncture.
- You spot a bulge on the tread or sidewall (following an impact, etc.).
- There’s a gash deep enough to expose the nylon or steel belts (which are part of the internal structural components of the tire).
- The size of the gash or hole in the tread is greater than one-quarter inch.
- The tire has been repaired before and the new damage is close to the previous repair.
- If for any reason the repair exceeds the tire manufacturer’s recommendations.
Underinflated Tires May Damage the Sidewall From Excessive Heat
Tires with low air pressure may be hard to detect while driving. An underinflated tire generates a lot of heat quickly, which may cause the sidewall to break down in seconds. Therefore, an underinflated tire can be damaged beyond repair within a short distance. Simply driving on a severely underinflated tire from the fast lane to the shoulder can cause irreversible damage.
Slow Leaks in the Contact Patch Can Be Repaired
If you have a slow leak from a puncture in the main part of the tread, chances are good the tire can be repaired. Done right, your repaired tire should be safe to drive on for its full tire life. Additionally, the repair may be free (depending on your warranty).
Les Schwab Tip: We do more than just patch tires. Our experts use a multi-step process to ensure your tire is properly repaired.
Basics of Flat Repair
First, the tire technician will identify the location of the leak and make sure there are no others by submerging the tire and wheel in water. Then they’ll take the tire off the wheel (called dismounting), and inspect the inside and outside for structural problems and previous repairs.
If the tire is repairable, they’ll start by buffing the affected area being careful to avoid any damage to the liner. Then they’ll use vulcanizing compound and a one- or two-piece plug patch combination to fill the hole and seal the liner. This method ensures an airtight seal and that the cord material is protected.
Do Emergency Tire Repair Kits Work?
If your vehicle doesn’t have a spare, or you need to get out of an emergency situation, you may be relying on a sealant kit or other quick-fix option when you get a flat. This isn’t a substitute for proper repair.
At Les Schwab, we’ve been cleaning, sealing, and repairing flat tires for a long time. We’ve seen a lot of do-it-yourself options over the decades, but emergency plug kits are not among the best options. The use of a plug kit to fill a hole from the outside of your tire can cause additional, internal damage that may be difficult or impossible to repair. Additionally, some aerosol sprays can damage the TPMS sensor in your wheel, which can be expensive.
Bring Your Flat Tires to Les Schwab
If you’re driving on a set of Les Schwab tires, we’ll fix your flat for free. If the tire cannot be repaired, we’ll show you all of your options and get you back on the road safely.
Why Do My Tires Squeal?
You’ll most often hear your tires squeal during fast acceleration, braking and turns. The sound you hear when you’re speeding up is the tread skidding against the road surface as it tries to gain traction. Skidding is also the cause of a squeal during hard braking. Sharp cornering can cause the rubber to slide laterally on the road surface, producing a sound. If you notice sound even when taking gentle turns, you may have underinflated tires that are flexing too much. Or there could be an alignment issue.
Tire sounds don’t always mean there’s problem. For example, turning on a tight radius at slow speed, like in a parking garage or on painted surfaces, often causes a squeaky shoe sound. This is from normal tire slippage on such surfaces, which are a lot slicker than typical asphalt. In an enclosed space, the sound can echo and seem much louder, but it’s harmless noise.
There’s a risk of confusing normal tire squealing with sounds that indicate other problems like misalignment or worn brake pads or suspension parts. Here’s a list of possible squealing sound issues and sources.
They call it peeling out for a reason. When you floor it, your tires immediately spin at a much higher rate than they were initially going. The tires slip before they get full traction. Some of the rubber on the tread gets peeled off and left on the road, and you hear that squealing sound effect.
Conversely, hard braking will abruptly slow tires revolving at a much higher speed. As when accelerating quickly, skid marks and squealing indicate that your tires have dragged along the blacktop rather than rolling, leaving behind some rubber.
Tires slip sideways some during a turn, which is how your car changes direction. There’s a difference between the direction the tires are pointing and the direction the vehicle is moving. When this transition happens at higher speeds, the vehicle will slide more, causing tires to squeal.
Underinflated tires cannot compensate for the physical forces at work during a turn. When you take a corner on well-inflated tires, they keep their shape better, which allows them to maintain the right amount of contact with the road. If your tires are low, the sidewalls flex too much and cannot generate enough traction to turn the car smoothly. Instead, the rubber will slide sideways more, causing a squeal. (Keeping tires filled at the proper pressure will also extend their tread life.)
Tires that are getting to the end of their life or have uneven wear, will squeal more. If you’ve got uneven tread pattern or depths, you’ll have less road grip. So when you take corners, accelerate or brake, your tires will slip more easily.
Other Car Parts
Wheel-tire issues aren’t the only causes of auto noise. Other possibilities include:
- A brake pad wear indicator. If what started as a squeal becomes a metal-on-metal grinding sound, you are overdue for brake servicing.
- The alignment. Your vehicle’s suspension could be off, and the toe or camber angles need adjustment.
- Suspension parts. The bushings or bearings could be worn.
- Steering system parts. Tie-rod ends, seals, ball joints or universal joints may need lubrication.
- A loose or worn engine drive belt. Suspect this if squealing increases with engine speed.
What To Do About Squealing
Get your tire pressure checked first. If that’s not the problem and the noise persists, don’t ignore it. Bring your car in for service to find the source. You might head off much costlier repairs.
Fun fact: Along with castle thunder, bullet ricochet and the Wilhelm scream, car skidding is among the most overused special sound effect in Hollywood.
Do You Know How to Drive If Your Tire Goes Flat?
When a tire goes flat or completely comes apart while you’re driving at highway speed, you can catch even the most experienced driver off guard.
Here’s what to do if it happens to you, along with a checklist for preventing flats.
How Can You Prevent Flat Tires?
Avoid tire failure by following these easy tips.
- Check tire pressure monthly, including the spare.
- Slow down if you have to drive over a pothole or other object in the road.
- Don’t run over curbs or other foreign objects in the roadway, and try not to hit or rub the curb when parking.
- Inspect tires for uneven wear patterns on the tread, cracks, foreign objects, or other signs of wear or trauma.
- Remove any stones, bits of glass or other foreign objects wedged in the tread.
- Make sure your tire valves have caps.
- When carrying heavy loads, you should be extra careful about proper tire pressure. Overloading and low tire pressure can cause a tire to overheat, leading to tire failure.
Three Easy Ways to Stay on Top of Tire Care
Tire maintenance. Like dental appointments or mowing the lawn, it’s tempting to put it off.
But kicking the maintenance can down the road may mean bigger hassles or more costly problems later. Doing simple things like having your air and treadwear checked regularly can significantly extend the life of your tires, saving you money.
Keeping track of tire pressure, rotations, rebalancing and alignment doesn’t have to be a chore. Below are three simple ways to remember what to do when.
These recommended schedules are based on a driver who is logging about 12,000 miles per year. You may need tire service more often if you regularly drive off road, have specialty tires or sizes, use your vehicle for work or commercial purposes, or drive aggressively.
(Note: Don’t delay getting your tires inspected if your TPMS warning light goes on, you notice irregular wear, you’ve had a hard impact with a pothole or road debris, or there are signs of tire imbalance. Visual tire inspections are always free at any Les Schwab Tires.)
1. Track by Miles Driven
- Check tire pressure and treadwear every 1,000 miles or monthly.
- Get tires rotated and balance checked every 5,000 miles.
2. Time Tire Care with Events or Other Auto Care
- Get air pressure and treadwear checked the first of the month.
- Get tires rotated and rebalanced when you get an oil change (at least every five months).
- Get alignment checked when Daylight Savings Time ends as part of regular maintenance. Do it sooner if you hit a big pothole or road debris, or notice poor handling, wandering, loose steering or that your steering wheel isn’t level.
3. Get Email Notices When You’re Due
If you’d like personalized notices for your vehicle, we’ll keep track for you. We’ll send you service reminders when your tires are due for inflation and treadwear checks, rotations and rebalancing. (A lot of this maintenance is done free for customers of Les Schwab Tires.)
Regular tire care means noticing small problems early so they don’t become big and expensive issues later. It protects your investment in your tires and keeps them in safe running condition.