What does 100y mean on tires?

[NolanDella]

Tire 100 represents the load index, and y represents the maximum speed of 300km/h. The load capacity of a 100 tire is 800KG, and the higher the number, the stronger the load capacity. Generally, for heavy vehicles with 400cc to 750cc, the J value is about 63-67, while the front wheel is about 57-58. Here is some related information about tires: 1. Under normal circumstances, ordinary cars should not use tires with an aspect ratio >75%, while luxury cars and high-performance sports cars are recommended to use tires with an aspect ratio <60%. 2. Tires are classified by purpose, including load-bearing tires, passenger car tires, and mining tires, among others. Load-bearing tires must indicate the ply rating in addition to the size specifications marked on the sidewall. 3. The ply rating of load-bearing tires does not refer to the actual number of layers, but rather to the tire body made of high-strength material cords, whose load performance is equivalent to the number of layers of tire fabric made of cotton cords.