Back to all

By the Numbers: Tire Replacement at Perfect Tune Auto Repair in Brighton

October 11, 2020

Ever notice that your tire is covered with writing? It's like some hieroglyphic art form. Of course, Brighton 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 Brighton 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 Brighton 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 Brighton 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 Brighton, 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 Perfect Tune Auto Repair 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 Brighton 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.

Perfect Tune Auto Repair
5434 S. Old US Highway 23
Brighton, Michigan 48116
810.227.9903
https://www.perfecttuneautorepair.com

Need Service?

Request a Quote

More articles from Perfect Tune Auto Repair

Introduction to Diesels for Brighton, Michigan

May 10, 2026

Something you're going to be hearing a lot about around Brighton, Michigan, is diesel engines. We're not talking about semi-trucks and buses; we're talking about diesel engine cars, pick-ups and SUVs.Most people in Michigan are surprised to learn that around half the cars on the road in Europe ha... More

The Perfect Tune Auto Repair Guide to Vehicle Diagnosis

May 3, 2026

Modern Brighton vehicles have several computers on board that control all kinds of things like engine functions, transmission shifts, traction control, anti-lock brakes, stability control, emissions and on some vehicles, even steering, braking and the throttle.Think about that for a minute thin... More

Don't Start with That (Bad Starter Motor)

April 26, 2026

We've all heard that expression, "That's a non starter." When it comes to your vehicle, that's not music to a driver's ears. That sickening sound when you start the ignition and instead of hearing the engine crank, you hear it slowly turn over and your dash lights go dim. There can be many reas... More