Rengasmerkinnät

Rengasmerkinnät refer to the markings found on the sidewall of a tire. These markings provide crucial information about the tire's specifications, performance characteristics, and safety standards. Understanding these markings is essential for proper tire selection, maintenance, and safe operation of a vehicle.

The most common markings include the tire size, which is typically presented in a format like P205/55R16. The "P" indicates passenger vehicle, "205" is the tire's width in millimeters, "55" is the aspect ratio (the tire's height as a percentage of its width), "R" signifies radial construction, and "16" is the diameter of the wheel rim in inches.

Other important markings include the load index and speed rating. The load index is a numerical code that corresponds to the maximum weight a tire can support. The speed rating is a letter code indicating the maximum speed at which the tire can safely perform. These are usually found together, for example, 91V.

Additionally, tire markings may include information about the tire's construction, such as treadwear, temperature, and traction ratings (UTQG ratings in the United States). The treadwear rating is a comparative guide to the expected lifespan of the tire's tread. Temperature ratings indicate the tire's resistance to heat buildup. Traction ratings measure the tire's ability to stop on wet surfaces. Other common markings include the tire's manufacturer, model name, country of origin, and certifications like DOT (Department of Transportation) or ECE (Economic Commission for Europe) approval.