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Frequently Asked Questions

Question:

How do I read the sidewall of my tire?

Answer:

The side of a tire contains information needed for your safety and that of your customer. Being able to read sidewall markings will help you better understand the performance of each tire. It will also provide you with information when mounting and servicing the tire.

Passenger Tire Sizing
Three primary sizing systems exist for passenger tires today: P-Metric, European Metric and Millimetric. Each of these systems evolved from the first tire sizing system-the Numeric Sizing system-that is now obsolete. It was developed when all tires had the same aspect ratio, and it provided only the nominal cross section width of the tire and the rim diameter in inches. The following are examples that identify the three sizing systems that are commonly seen today.

P-Metric
The P-Metric sizing system was developed to better align with the European tire sizing system. It provides a better description of the tire size. See examples below.

European Metric
Essentially, this system was a conversion of the Numeric system from inches to millimeters. Aspect ratio appears in the size designation in most cases where it is other than 82.

Light Truck Tire Sizing
Sizing for light truck tires takes the performance requirements of the vehicle, and the tires, into account. Light truck tires have evolved along with the expanded applications of trucks and vans that have grown to be multi-purpose vehicles that we use for work, for recreation or as passenger vehicles.There are three primary light truck tire sizing systems: Light Truck Metric, Light Truck High Floatation and Light Truck Numeric.

Light Truck Metric
This sizing system mirrors the P-Metric system for passenger tires.

Light Truck High Flotation
Light truck high flotation tires have evolved as lower aspect ratio tires became more popular on light trucks. The combination of lower aspect ratios and high flotation yielded better traction on sand and soft soil found in off-road situations.

Light Truck Numeric
This older system is still widely used, mostly on commercial vehicles.

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  • You need to know your vehicle's options to find out the original size of the tires for your vehicle because automobile manufacturers often use different wheel and tire sizes for different variations of a specific vehicle.If you do not know your vehicle's options, check one of these places:<br><br>1. The original sales invoice or window sticker when you bought the vehicle. <br>2. Your vehicle's Owner's Manual, which will sometimes identify your vehicle's options.<br>3. Look on the vehicle itself. Some vehicles have a decal or lettering that indicates the options located on the side or rear of the vehicle.

  • Your vehicle was manufactured with multiple tire sizes. Please select your size.

    Knowing your tire size can help save time at the tire retailer. It also enables you to make an informed tire purchase.You can find your vehicle's original equipment tire size in one of the following places:<br><br>1. On the tire placard located on the driver's door jamb <br>2. In your owners manual <br>3. On glove compartment door <br>4. Inside the fuel hatch or trunk lid You can also check your existing tire's designation on the sidewall. However, there is no guarantee that these are the original tire size unless they came on the vehicle new.
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  • Find the exact tire quickly using your tire size. Check your owner's manual or tire sidewall to find the required specifications.

  • You can determine your tire type by looking at the tire's designation on the sidewall of your tire. The following describes the differences between the tire type designations:<br><br> P-Metric: A uniform designation of tire sizes in metric measurements. A typical P-Metric tire is P205/70R14 93S. <br><br>European Metric: This system was a conversion of the numeric system from inches to millimeters. The aspect ratio appears in the size designation in most cases where it is other than 82. A typical European Metric tire is 185/70R14 88S <br><br>Light Truck-Metric: This system is used for light truck tires, and it mirrors the P-Metric system used for passenger tires. A typical Light Truck-Metric tire is LT245/75R16 120R. <br><br>Light Trucl High Flotation: This type is for light truck tires with lower sidewalls and wider treads that yield better traction on surfaces such as sand and soft soil found in watery, off-road situations. A typical tire is 31X10.50R15 LT LRC
  • This three-digit number represents the width of your tires in millimeters (mm).<div><img src="/assets/bfg/system/images/contextual-help/R2-width.png" /></div>
  • The aspect ratio is the relationship of a tire's sidewall height to its section width, expressed as a percentage. In this example, the tire sidewall height is approximately 55% of the tire width.<div><img src="/assets/bfg/system/images/contextual-help/R2-aspect.png" /></div>
  • DOT codes can be found on your dealer registry card or on your tires. Multiple tires may have the same DOT code or they can be different. Please check each tire and make sure to double check the code you enter.
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  • If you know the name of the tire are looking for, select the tire from the list below.

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  • All tires fall into certain categories. If you're wanting to do a broad search of our tire lines, use the list below.

  • All tires fall into certain categories. If you're wanting to do a broad search of our tire lines, use the list below.
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