Frequently Asked Questions

Question:

How to 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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  • In order to find your vehicle's options please check the following:
- The vehicle's window sticker, or a decal usually located on the side or rear of the vehicle
- The vehicle owner manual
- Your original sales invoice.
  • Your vehicle was manufactured with multiple tire sizes. Please select your size.

    In order to find your vehicle's original equipment tire size please check the following:<br> - The tire placard located on the driver's door jamb<br> - Your owners manual<br> - On the glove compartment door<br> - Inside the fuel hatch or trunk lid <br>  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<div><img src="/assets/bfg/system/images/contextual-help/R2-Size.png"></div>
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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.

  • This three-digit number represents the width of the tire in millimeters (mm), measured from sidewall to sidewall. Since this measure is affected by the width of the rim, the measurement is done when the tire is on its intended rim size.  <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. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall.<div><img src="/assets/bfg/system/images/contextual-help/R2-aspect.png" /></div>
  • The diameter of the rim in inches.<div><img src="/assets/bfg/system/images/contextual-help/R2-diameter.png" /></div>
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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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