Decoding Tire Markings and Numbers

Have you ever wondered about the mysterious markings and numbers on your vehicle’s tires? These markings hold essential information about your tires, including their size, type, load capacity, speed rating, and more. Understanding these codes can help you choose the right tires, maintain proper tire care, and ensure your safety on the road. In this blog post, we’ll demystify the markings and numbers on your tires, so you can make informed decisions about your vehicle’s most critical contact points.

Tire Size Marking

The tire size marking is a combination of letters, numbers, and symbols that indicate the tire’s dimensions. It typically looks like this: P215/65R16.

• P: Stands for “Passenger” and indicates the tire is designed for use on passenger vehicles.

• 215: Represents the tire’s width in millimeters from sidewall to sidewall when mounted on a specified width wheel.

• 65: The aspect ratio or profile height as a percentage of the tire’s width. In this case, the sidewall height is 65% of the tire’s width.

• R: Indicates the tire’s construction type, in this case, “Radial.”

• 16: Represents the diameter of the wheel (in inches) that the tire is designed to fit.

Load Index and Speed Rating

The load index and speed rating are usually represented by numbers and letters after the tire size marking.

• Load Index (LI): This number corresponds to the tire’s maximum load-carrying capacity when properly inflated. You can refer to a load index chart to determine the exact weight capacity of your tire.

• Speed Rating: The speed rating indicates the maximum speed a tire can sustain under ideal conditions. It’s represented by a letter, such as “V” (149 mph) or “H” (130 mph). Match the speed rating to your vehicle’s capabilities to ensure safe performance.

Tire Type and Seasonal Markings

Tires come in different types, and these are indicated by symbols:

• M+S or M/S: Indicates that the tire is designed for mud and snow conditions. It’s often found on all-season tires.

• Winter Tire Symbol: A mountain with a snowflake indicates that the tire is a dedicated winter tire designed for better performance in snowy and icy conditions.

Tire Brand and Model

Some tires display the brand name and model on the sidewall. This can help you identify the manufacturer and type of tire you have.

• UTQG Rating: The Uniform Tire Quality Grading (UTQG) rating provides information about a tire’s treadwear, traction, and temperature resistance. It’s displayed as a series of numbers and letters, such as “400 A A.” The higher the treadwear number, the longer the tire is expected to last. The letters represent traction (A, B, C) and temperature resistance (A, B, C), indicating how well the tire performs in wet and dry conditions.

• DOT Number: The Department of Transportation (DOT) number on the sidewall indicates that the tire meets specific safety standards. It also includes information about the tire’s manufacturer and production date.

Understanding the markings and numbers on your tires empowers you to make informed decisions about your vehicle’s tires. From choosing the right size to considering load capacity, speed rating, and seasonal suitability, these markings provide a wealth of valuable information. The next time you glance at your tires, you’ll know that they’re not just black rubber; they’re packed with essential data that contribute to your vehicle’s performance, safety, and overall driving experience.

Do I Need Snow Tires?

As winter approaches, many Chicagoland residents start to wonder whether they need snow tires for their vehicles. Our area is no stranger to harsh winters with heavy snowfall, icy roads, and frigid temperatures. But do you really need snow tires in the city and suburbs? We’ll explore the factors to consider when deciding whether snow tires are necessary for your safety and peace of mind during the winter months.

Weather Conditions

Illinois winters can be unpredictable, but they often bring significant snowfall and icy conditions. Snow tires are designed with deeper treads and softer rubber compounds that provide better traction on snowy and icy roads. If you live in an area that typically experiences heavy snowfall, investing in snow tires can significantly improve your safety and control on the road.

Temperature Matters

It’s not just about snow on the ground; it’s also about temperature. Winter tires are designed to remain flexible in colder temperatures, improving grip and handling. When the thermometer drops below 45°F (7°C), all-season and summer tires can become less effective and lose traction. Given our cold winters, this is another reason to consider snow tires.

Road Maintenance

Consider the road maintenance in your area. Some neighborhoods in and around Chicago suburbs may not see prompt snow removal or salting, making winter tires a valuable addition. Snow tires can help you navigate less-maintained roads with more confidence.

Safety First

Safety is paramount. Snow tires can significantly reduce the risk of accidents in winter conditions. The improved traction and handling they provide can help you avoid skids and maintain control, which is crucial in our winter weather.

Cost Consideration

While snow tires are a wise investment for many Chicagoland residents, they do come at a cost. However, it’s essential to weigh this cost against potential accidents, property damage, and insurance premiums. Winter tires can extend the lifespan of your all-season or summer tires since you’ll use them less during the colder months.

Versatility of All-Season Tires

If you’re on the fence about snow tires, all-season tires can be a viable option for milder winter conditions. All-season tires are designed to perform well in various weather conditions, including light snow and cold temperatures. However, for the best winter performance, snow tires are still recommended in areas with severe winter weather. While the decision to invest in snow tires ultimately depends on your specific circumstances and budget, they are an excellent choice for those who prioritize safety and peace of mind during the city’s harsh winters. The combination of heavy snowfall, low temperatures, and potential road hazards make snow tires a valuable addition to your vehicle. If you’re unsure, consult with your local tire experts at My Mechanic to determine the best option for your needs. Ultimately, the right tire choice can help ensure your safety and ease of travel during the winter season.

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When you see accidents on icy roads, do you wonder if winter tires would have prevented them? Do you think that people who keep “all-season” tires on their cars all year are just asking for an accident? 

There are a few things you should know about winter tires VS. all-season tires, especially if you are considering buying new tires in the future. 

Let’s take a look at the facts and myths, as well as the differences, between winter and all-season tires. 

The Two Big Differences 

There are two major differences when talking about all-season tires and winter tires. 

The first is that winter tires have a different tread. The tread pattern on winter tires has multiple narrow cuts across the tread. These are called “siping” and these small cuts give a winter tire small, sharp edges, like extraordinarily strong fingernails, that grip or bite into snow. 

The second is that winter tires contain a softer rubber compound than all-season tires. Softer rubber means better grip. The harder rubber in all-season tires tends to become harder below freezing and slide around more easily. 

Facts, Myths, and Half-Truths

Can winter tires increase your overall safety in snowy or icy conditions? 

• Myth: Winter Tires Don’t Slide on Ice – Unfortunately, this isn’t true. Winter tires will most definitely slide on ice-covered roads. Traveling too fast for the conditions and hard braking will most definitely cause your car to slide over the ice, winter tires, or no! The only real solution for ice is studded tires. 
• Fact: Using Winter Tires Costs More- There is no denying this one. While winter tires don’t necessarily cost more than an all-season tire, most people don’t want to use them in the summer. This means that you must pay to have the winter tires removed in the early spring and your all-season tires exchanged for winter tires in late fall. To avoid some of this expense, you can buy a second set of rims and have your all-season tires mounted on them. You can store the tires and rims in your garage or another area, and then simply exchange both tires and rims every year. Changing the tire and rim is a job you can do yourself in your own driveway! 
• Half-Truth: Winter Tires Perform Better in Cold Weather- This is partially true if you are talking about snowy roads. Both tires work equally well in cold, dry conditions, but if you drive on snow-covered roads frequently, then yes, winter tires will definitely be a huge plus when it comes to traction. 
• Myth: If You Have Winter Tires, You Drive at Normal Speeds- Don’t we wish things were this easy? The fact is that winter tires, good as they are, will slide on ice or very slick roads. No matter how good the salesperson says they are, winter tires are still tires and they have limits! Always drive more slowly in poor weather conditions, even if you have brand new, top-of-the-line winter tires! 
• Fact: Winter Tires Do Not Do Well in Wet Weather or Summer Temps: Remember that one of the main differences between the two types of tires is that winter tires are softer? That makes them noticeably mushier during the hot summer months. Above 60 degrees, winter tires will give your vehicle a wobbly feeling when making turns and the steering wheel will feel a bit loose as if something is loose in the front suspension. At highway speeds in the summer, winter tires can be downright dangerous. They have poor braking ability in wet or warm weather. If you use winter tires, you would be smart to change them out every spring. 
• Myth: Two Winter Tires on the Drive Axle are All You Need- This is a big NO, NO, NO. While it’s true that the drive axel does most of the work, you still need stability on all four wheels. If you need proof: after the next heavy snow, try walking outside with a winter boot on one foot and a summer sandal on the other foot. Case closed. 
• Half-Truth: Winter Tires Are SO Noisy- While that used to be the case a few decades ago, it’s not really true now. A few heavy-duty pickup trucks may need heavier winter tires that cause noise but for your everyday passenger car or SUV, you will find that they don’t make nearly as much noise as the toddlers in your back seat do! 

Winter Tires or All Season

While most people like the idea of winter tires, the same amount of people don’t want the added expense of paying for and keeping two sets of tires. 

Is there a price on safety? Imagine if you could see the future and you knew that if you put winter tires on your ride, you would avoid a terrible accident? Would they seem expensive if you knew that? 

Of course, no one can predict or see the future and the fact is that not everyone CAN afford a second set of tires. If you are fortunate enough, however, you should seriously consider investing in a second set of winter tires. 

At My Mechanic, we know a whole lot about tires. If you are unsure about the current condition of your tires, if you are wondering which tire would work best for your driving habits, or if you have any other questions regarding tires, brakes, or other automotive needs, we have the answers. 

Call us today at My Mechanic. Make an appointment or call us with your questions. We are the automotive experts, and we want to help. Call today while you are thinking about it! You’ll be glad you did. 

The post Ice Storms, Winter Tires, and Icy Roads: Truth VS. Fiction appeared first on My Mechanic Inc. | Elmhurst - Clarendon Hills Auto Repair Experts.

You should think about having your vehicle winterized before the cold stuff really socks it to Chicago. Ice, hail, below freezing temps, and let’s not forget about rock salt, slush, and mud. Ugh.

If your vehicle is more than 5 years old, you should take extra precautions to prepare for winter driving conditions so you can be ready for anything Mother Nature throws our way.

Top 10 Tips for Winterizing Your Vehicle

The last thing anyone wants is to be stranded somewhere with a dead car or one that doesn’t run as it should. While roadside assistance is available, how many times have you been told that the service is super busy, and it will be hours before they get to you?

The following tips will help to prevent winter-related car problems.

1. Inspect the Battery

This is the #1 issue when the weather turns really cold. A marginal battery that might seem perfectly fine in 60-degree weather will die a quick death once it hits 35 or below. Cold reduces the power of your battery so if yours isn’t 100%, chances are that it will give you trouble at the worst possible time.

You can’t tell if a battery will fail from looking at it. Have the professionals at My Mechanic test and inspect your battery to see if it will hold a charge. If your battery is 4 years old or older, chances are that it’s ready to kick the bucket.

Our experts will test your battery, inspect the case, and all the terminals and connections to ensure that everything is clean and makes a good connection.

2. Inspect Tires and Tire Pressure

When was the last time you took a good look at all 4 tires? Tires are one of the most important safety features on your vehicle. These are what connect your car or SUV to the road, so they must be in good condition and be properly inflated. You lose about 1 pound of air for every 10 degrees drop in temperature.

All 4 tires should have good tread, with at least 4/32nds of tread life left. There should be no bubbles, no bald spots, and no large chunks missing. If you use winter or snow tires, you might consider changing them this month.

If you aren’t sure about the condition of your tires, or if you are ready to switch your tires over to snow tires, the trained professionals at My Mechanic will be glad to inspect your tires and explain their overall condition or switch out your summer tires for winter tires.

3. Check the Coolant

Sometimes called antifreeze, the coolant in your car’s radiator can freeze if it doesn’t contain the proper mixture of water and coolant. If your vehicle has a small leak and you’ve been adding water all summer, chances are that you’ve got too much water in the cooling system. Time to repair that leak and refill the radiator and motor with the proper mixture of fresh coolant. Coolant loses its anti-freezing ability over time. If it freezes, it will cause major engine damage. It also becomes acidic over time, causing corrosion to the engine and other components. Flushing and filling the cooling system is extremely important. It should be done at least every 5 years or when cooling system repairs are done.

4. Wiper Blades

It’s a scary feeling when you can’t see clearly while driving, especially in bad weather. The wiper blades on your vehicle do a terrific job of clearing snow, rain, and mud from the front and rear windshield but only when they are in good condition.

Most wiper blades are made from rubber, which dries out in the hot summer months. Most people find that changing the front and rear wiper blades every other year is a good safety measure that can help you see clearly, regardless of the weather.

If you aren’t sure when you changed them last, you might want to consider changing them now as a safety precaution.

5. Washer Fluid

If you don’t already use a windshield washer fluid that is freezing weather-resistant, you should change it now. This way, even in the worst weather, you can keep the windshield clean and clear.

6. Wax the Headlights

If you are preparing to give your ride a nice wax to protect it through the winter months, wax the headlight covers as well. Slush, snow, and road salt can really stick to those plastic covers and prevent you from seeing as well as from being seen by others.

A light coat of wax over the plastic headlight covers will make snow and mud slip right off, rather than stick to the lights.

7. Change the Oil

When the really cold weather hits, your car needs a lighter weight oil to help it start more easily. It’s probably time for your regular oil change anyway, so why not get it taken care of right now, before everyone clogs up the mechanic’s shops looking to change to a more winter-friendly oil?

8. Prevent Frozen Car Doors

Ugh! If you have ever struggled with a frozen car door, you know what a pain in the butt that can be! You can prevent that by using something as simple as a dab of olive oil or cooking spray. Just a little bit goes a long way, so add a small amount to a rag, then wipe the rubber seal that goes around your doors. When the temperature gets below 25 degrees Fahrenheit outside, DON’T GO TO THE CAR WASH! Locks, doors, windows, trunks, and any exterior body parts will freeze up!

9. Inspect Belts and Hoses

Cold temperatures can really wreak havoc on the belts and hoses in your car. You certainly don’t want to be stranded with a broken belt or hose in the middle of a snowstorm! If you aren’t sure about the condition of these items, or if you can’t even see all of them (which is a quite common issue) Drop by My Mechanic. Our professional team of mechanics will be happy to inspect your belts and hoses and tell you if they need replacing.

10. Emergency Kit

Despite your best efforts, emergencies happen. If you have an emergency kit, it’s time to give it a once over. Replace the batteries in the flashlights, double-check any food or water you might have stored to see if it needs to be replaced (or if it got used since last winter).

If you don’t have an emergency kit, this is the time to make one. A typical kit should include:

• Jumper cables or a portable jump starter
• Small tool kit
• Tire Chains
• De-icing fluid (glycerin)
• Tire gauge
• Tire Changing Essentials, including the jack, lug wrench, and a good spare tire
• Blankets (even those aluminum emergency blankets are better than nothing), gloves, snow hat, spare pair of dry socks, and a few rags or an old towel
• First Aid Kit
• Extra coolant
• Duct Tape
• Water and Snacks
• Flashlights
• Flares

You might decide to add a few other items depending on your unique situation. Some people like to have a days’ worth of medications, a cell phone battery pack, and other items that you might deem necessary in case you become stranded.

Pro-Tip

We have seen a great many mishaps over the years, but a common one is also running out of gas. Even if you think you have enough gas to get to work and then to the gas station, all it takes is one accident to delay you for hours, which means either shutting off the car (and the heater!) or running out of gas.

During this time of year, we recommend that you always refill the tank once you hit the halfway mark. It is far better to be safe than freezing cold.

If you need help winterizing your vehicle or if it’s simply time for your car, truck, or SUV to be serviced, you can trust the ASE certified professionals at My Mechanic to keep your vehicle in tip-top shape for the upcoming winter weather.

The post Get Your Car Ready for the Really Cold Winter Weather Now appeared first on My Mechanic Inc. | Elmhurst - Clarendon Hills Auto Repair Experts.

Today we would like to talk about a subject that matters to everyone, but that few people like to think about: tires. Tires are something you know you need, but they also suck up a lot of resources—time, peace, and money.

How do you know if you really need new tires? What if you wait and try to “ride it out” (no pun intended) for another season? Why do some tires cost so much more than others?

Let’s take these subjects one by one so that you’ll feel good about your tires and will be more prepared when it comes time to replace them.

How to Tell if Your Car Needs New Tires

If you haven’t heard this old trick by now, it’s time you did. Take a penny and put good old Lincoln’s head in the tread of the tire. Can you see the top of his head? If so, then you need to replace the tires – pronto! This old measuring tool means that your tire has 2/32 inch of tread life left. Therefore, your tires are legally worn out. You could be cited for having unsafe tires at this level.

This is why it’s a good idea to replace them at 4/32 inch, not 2/32 inch. Many in the industry today recommend doing this test with a quarter instead of a penny and replacing the tires if the tread doesn’t reach George Washington’s head. Still not sure? Feel free to stop by and ask any one of us here at My Mechanic.

More Signs You Need New Tires

There are a few other signs that could indicate your car needs new tires beside tread wear. Usually if the tires have visible cracks on the sides, they are more than 6 years old. The rubber is no longer pliable. Good sized cracks can mean chemicals, including road salt and air pollution, have slowly eaten away at the rubber. Unless the cracks are tiny, chances are your tires are old enough to be replaced, even if the tread is still good.

If you see any type of bubble on the tire, it should be replaced as quickly as possible. This is a blowout waiting to happen. Inspect the entire tire, not just the part you can see when you stand next to the car.

To get a closer look at the tread, get a stool, a mirror, or get down on your knees. If the inside, middle, or outside portion of the tread is thinner (or heaven forbid, bald!), your car might have a problem with the front end suspension or the wheel alignment. These issues put uneven pressure on one side of the tire, wearing it down significantly faster than the rest of the tread.

You should first have the front suspension inspected and have any suspension parts replaced if necessary. When this is done, you can replace the tires and have the vehicle aligned. (Yes, you will have to replace the tires. There is no way to “use up” the rest of that tread.)

Note: Replacing the tires when your car needs front suspension work or a four-wheel alignment is a waste of money because the tires are going to wear in this same pattern.

A Word about Snow Tires or Winter Tires

In the olden days (a.k.a. – maybe 25 years ago), winter tires differed only from regular tires in the design on the tread. These had large knobs or lugs on them that were supposed to give you better traction in the snow. They didn’t work very well, and to top it off, they were extremely noisy.

Today, you will mostly see “all-season” tires advertised. While this term “all-season” may apply to California or Arizona, in Chicagoland, it’s a hit or miss.

In a very mild winter and careful driving, today’s modern tires will do a decent job of getting you to point A and point B. The problem with all-season tires is that below 45 degrees, these tires tend to become less flexible. This means that they don’t grip the road as well, and they can suffer a blow out simply from hitting a good-sized pothole.

Winter tires are much better suited to Chicago weather. They are designed to move snow and water using a compound that allows the tire to bite into snow and ice, giving you better traction. Winter tires also have wider grooves to expel snow from the tread, and the sipes (which are very thin slits cut into the tread) really grab onto ice to provide superior traction. How much traction? On average, winter tires get about 58 percent better traction than all-season tires. That’s the difference between getting home safely in time for dinner and spending the night waiting for a tow truck to pull you out of a snow bank.

Of course, we understand that not everyone has room to store winter tires or the money to buy these. However, if at all possible, consider putting a set of winter tires on your ride so you can really feel safe about driving this year.

We still have a lot to cover regarding tires. Tune in next month to see how this tire story ends. If you can’t wait, drop by My Mechanic for a tire inspection. We’re happy to talk tires with you, so you’ll be prepared for the weather this year.

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