rengasmerkinnäistä

Rengasmerkinnät, or tire markings, are a standardized system of alphanumeric codes found on the sidewall of tires. These markings provide essential information about the tire's specifications and characteristics. The most prominent marking typically indicates the tire's size, including its width in millimeters, aspect ratio (the tire's height as a percentage of its width), and rim diameter in inches. For example, a marking like 205/55R16 signifies a tire width of 205 millimeters, an aspect ratio of 55%, and a rim diameter of 16 inches, with "R" denoting a radial construction.

Beyond size, rengasmerkinnät also convey information about the tire's load index and speed rating. The load index is a numerical code representing the maximum weight the tire can support, while the speed rating is an alphanumeric code indicating the maximum speed at which the tire can safely operate under its specified load. Other important markings include the tire's construction type (e.g., radial or bias-ply), treadwear, traction, and temperature resistance ratings, often referred to as the Uniform Tire Quality Grading (UTQG) system in some regions. Finally, manufacturing date codes, typically a four-digit number representing the week and year of production, are also present. Understanding these markings is crucial for selecting the correct replacement tires and ensuring safe vehicle operation.