The side of your tyre — known as the sidewall — contains all of the information you need to know about your tyre. Whether your tyre comes from Goodyear or some other manufacturer, all tyres are required to show this information.

**Tyre Type** defines the proper use of the tyre. For example, the “P” on the tyre shown here means that this is a passenger car tyre. If the tyre had an “LT” designation, the tyre would be for a light truck.

**Tyre Width** is the width of the tyre measured in millimeters from sidewall to sidewall. This tyre width is 215 millimeters.

**Aspect Ratio** is the ratio of the height of the tyre's cross-section to its width. On our example, 65 means that the height is equal to 65% of the tyre's width.

**Construction** tells you how the layers of the tyre were put together. The “R” stands for Radial which means the layers run radially across the tyre. A “B” stands for bias construction which means that the layers run diagonally.

**Wheel Diameter** is the width of the wheel from one end to the other. The diameter of this wheel is 15 inches.

**Load Index** indicates the maximum load in pounds that the tyre can support when properly inflated. You'll also find the maximum load elsewhere on the tyre sidewall, both in pounds and kilograms.

**Speed Rating** tells you the maximum service speed for a tyre. “H” means that the tyre has a maximum service speed of 130 mph. This rating relates only to tyre speed capability and is NOT a recommendation to exceed legally posted speed limits.

**DOT** means that the tyre complies with all applicable safety standards established by the U.S. Department of Transportation (DOT). Next to this is a tyre identification or serial number — a combination of numbers and letters up to 12 digits.

**UTQG** stands for Uniform Tyre Quality Grading, a rating system developed by DOT. For more information on UTQG, continue here.