What does 91V 91W mean on tires?

[VonJade]

Tire specification model markings 91V and 91W, where 91 represents the tire's load index, indicating that the maximum load capacity of this tire is 615kg. Here are the relevant explanations: 1. Difference: The difference between 91V and 91W tires lies in the letters V and W at the end. The letters represent the speed rating of the tire, with V indicating that the tire can withstand a maximum speed of 240km/h, and W indicating that the tire can withstand a maximum speed of 270km/h. In other words, a 91W tire refers to a tire that can bear a load of 615kg and withstand a maximum speed of 270km/h. 2. Speed rating: Based on the different maximum speeds they can withstand, tire speed ratings can be divided into different grades from A to Z, with grade A further subdivided into eight different levels from A1 to A8. Generally speaking, the further back the letter representing the tire speed rating is in the alphabet, the better the tire performance.