Tire Size – How To Figure It Out

How to Read Your Tire Size

When you’re buying new tires, we want to help you understand the right size tire for your vehicle. Once you locate your tire numbers on the tire’s sidewall use the diagram below to find the meaning of your tire. In addition to your sidewall you can also find your tire size on the inside of your door, or inside your glove box or within your gas tank hatch.

Tire Size Calculator

Tire Size

P = “P-Metric”.

This is the most common type of tire and represents a passenger vehicle (cars, minivans, light-duty trucks, SUVs) An “LT” designation is for a light truck. No letter before the width indicates that it is a European metric tire

205 = 205 millimeters.

Tire width is the width of the tire measured in mm from sidewall to sidewall.

55 = 55% of the section width.

Aspect ratio (profile measurement) is the ratio of the height of the tire’s cross-section to its width. 

R = Radical construction.

The letter following the aspect ratio represents the tire’s construction. R means the layers run radially across the tire. “B” stands for bias construction, which means that the layers run diagonally across the tire. 98% or more tires are R. 

16 = Used on a 16-inch diameter wheel.

The number following the construction letter represents what diameter wheel the tire should be matched with. 

91 = Load index.

Load index is an assigned number that corresponds with the load-carrying capacity of a tire. Most passenger car tire load indexes range from 75 to 100, but a few carry more. You’ll also find the maximum load elsewhere on the tire sidewall, both in lbs and kg.

V = Speed rating.

Lastly, speed rating tells you the maximum service speed for a tire. A speed rating isn’t, however, a recommendation to exceed speed limits, and doesn’t indicate how well a tire handles or corners.

Tire On Road

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