What Do the Numbers on Tires Represent?

[LeDeclan]

The numbers on tires represent the tire specifications, load index, and speed rating. For example, in 215/55R16 93H: 215 indicates the tire section width; the slash simply separates the preceding and following numbers, with the latter number 55 representing the aspect ratio; the letter R stands for radial tire (absence of R may indicate bias-ply tire); the number 16 following the letter denotes the rim diameter; 93 is the load index; and the letter H signifies the speed rating. Tires are circular elastic rubber products mounted on various vehicles or machinery for ground rolling. They are typically installed on metal wheel rims to support the vehicle body, absorb external shocks, maintain contact with the road surface, and ensure driving performance.