What does the 3T index on tires mean?

[OMichael]

3T markings refer to the treadwear index, traction index, and temperature index. Below is relevant information about the 3T markings: 1. These three index levels respectively indicate the degree of wear resistance, grip, and high-temperature resistance. The treadwear index reflects the tire's wear resistance—the higher the value, the more wear-resistant the tire is, but the harder the rubber becomes, resulting in poorer comfort. Conversely, the lower the value, the less wear-resistant the tire is, with softer rubber and better comfort. 2. TREADWEAR 220 indicates the tire's wear resistance index is 220. Generally, a wear resistance index between 280-320 is considered moderate, as tires that are too wear-resistant may compromise comfort. TRACTION A represents the traction index, with grade A indicating relatively strong grip. Traction levels from highest to lowest are AA, A, B, and C, with lower grades indicating progressively weaker grip. 3. TEMPERATURE A represents the tire's temperature grade, with grade A indicating a relatively high level of high-temperature resistance. For passenger car tires, the temperature grades from highest to lowest are A, B, and C.