What does XL on tires mean?

[Mario]

XL on tires stands for Extra Load (i.e., reinforced load index) tires, which are typically used for heavy-duty vehicles such as trucks, lorries, buses, and other engineering vehicles. Tires are circular elastic rubber products mounted on various vehicles or machinery to roll on the ground, usually installed on metal rims. They support the vehicle body, absorb external shocks, ensure contact with the road surface, and maintain driving performance. Tires often operate under complex and demanding conditions, enduring various deformations, loads, forces, and high-low temperature effects during use. Therefore, they must possess high load-bearing capacity, traction performance, and shock absorption. Additionally, they require high wear resistance, flexibility, and low rolling resistance with minimal heat generation. Half of the world's rubber consumption is used for tire production, highlighting the significant demand for rubber in tire manufacturing.