By the Numbers: Tire Replacement at Sterling Tire & Auto in Sterling Heights
December 3, 2017
Ever notice that your tire is covered with writing? It's like some hieroglyphic art form. Of course, Sterling Heights drivers know that it's not just graffiti, but to most of us, it might as well be. Would you like to know what all those codes on your tire mean? It won't lead you to buried treasure, but it could help you make a better tire purchase at your local Sterling Heights tire store.
Prominently featured on your tire is a set of numbers and letters that looks something like this: 225 50 R 16 92 H. The first number is the width of the tire in millimeters, or the width between the sidewalls of the tire when it is fully inflated and not carrying a load. When Sterling Heights drivers replace tires, they need to match this width number, or the tires won't fit properly in the wheel wells.
The 50 is the aspect ratio of the tire, which is measured by taking the height of the sidewalls and dividing it by the tread width. If you drive off-road around the Sterling Heights area, it should have a high aspect ratio. For high performance on the road, you want a lower aspect ratio.
The R simply means this is a radial tire.
The 92 is the load rating index, or in other words, a rating of how much load a tire can safely carry. If you frequently haul heavy loads around Sterling Heights, you will want a tire with a high load rating.
The last letter in our “code” sequence is the speed rating on the tire. Not all tires have this rating. In general, the closer the letter is to the end of the alphabet, the higher the speed rating. In other words, Z is the highest rating and A is the lowest. One exception: H comes between U and V. Why? Your guess is as good as mine.
If you'd just as soon ignore all of the markings on your tire, that's okay. When you need to replace your tires just ask your friendly and knowledgeable Sterling Tire & Auto tire professional for his auto advice on the best tires for you and your vehicle. Replacing tires is a standard part of preventive maintenance for Sterling Heights drivers vehicles. We all have to do it sooner or later. And the better we understand what we're buying, the better our vehicle will perform and the safer we will be on Michigan roads. Good vehicle care is informed vehicle care.
Sterling Tire & Auto
34701 Van Dyke Rd
Sterling Heights, Michigan 48312
586-264-7775
Need Service?
More articles from Sterling Tire & Auto
The Car Fluid Most Drivers Forget—And Why It Matters
August 23, 2026
Heres an automotive part you might not be familiar withthe differential. Its a component that transfers power from the driveshaft to the wheels. Its called a differential because the left and right drive wheels travel at different speeds when you make a turn. During that turn, the wheel on the ... More
Save Your Tires and Fuel: Why TPMS Is More Than a Warning Lightc
August 16, 2026
You know that little light on your dashboard that looks like a tire? Dont ignore it. Its a lot more than a warning light. Its trying to tell you something that can protect your tires, improve your fuel economy and keep your vehicle traveling safely down the road. Its called TPMS. The abbreviati... More
That Clunk Isn’t Normal: Why Your U-Joints Need Lubrication (Lubricate U-Joints)
August 9, 2026
If youve noticed a clunk when shifting from park to drive, accelerating from a stop or letting off on your accelerator, it may be your vehicle warning you about dry or failing U-joints. Those are small, critical components in your drivetrain that allow the driveshaft to flex as your suspension mo... More