The is actually a combination of two critical ratings: the Load Index (LI) and the Speed Symbol (or Speed Index). Together, they tell you the maximum weight a tyre can carry and the maximum speed it can safely handle.
The Tyre Index is not marketing jargon—it is a legally binding engineering specification. The 91 or 104 tells you if your tyre will collapse under the weight of your family. The V, H, or T tells you if your tyre will dissolve internally when you merge onto the freeway. tyre index
Before you buy your next set of tyres, photograph your current sidewall and the driver’s door placard. Match the numbers. Never downgrade. When in doubt, go up one Load Index (e.g., 94 instead of 91) but keep the Speed Rating identical. The is actually a combination of two critical
Unlike the Load Index, the Speed Rating is not a recommendation for how fast you should drive; it is a measure of the tyre's thermal endurance. At high speeds, tyres deform and generate extreme heat. A higher-rated tyre uses different rubber compounds (often silica-reinforced) and stiffer steel belts to dissipate that heat. The 91 or 104 tells you if your