How Many Types of Tire Ratings Are There?
2 Answers
Tire ratings are divided into two types: speed rating and load rating. The load rating is embossed on the sidewall of the tire, indicating the maximum load capacity of the tire. For driving safety, this load limit should not be exceeded. The speed rating of a car tire indicates the maximum speed at which the tire can carry a specified load under defined conditions. Different tires use letters from A to Z on the sidewall to represent speed ratings ranging from 4.8 km/h to 300 km/h. Letters closer to Z indicate higher achievable speeds. The numbers and letters on the tire sidewall contain information about the tire. Taking a tire with the specification 205/65R15 96H as an example, "205" represents the width of the tire's cross-section, "65" represents the aspect ratio (height to width ratio), "R" indicates that the tire is a radial tire, "15" represents the tire size, "94" is the load index, and the final "H" represents the speed rating.
I researched this last time I changed tires. The classification of car tires mainly depends on the speed rating and load index. The speed rating is indicated by letters, for example, a T-rated tire can go up to 190km/h, H-rated is 210km/h, and V-rated reaches 240km/h. The later the letter in the alphabet, the higher the speed capability, like track tires that can reach Y-rated at 300km/h. The load index is a number, for instance, 90 means a single tire can bear 600kg. My SUV came with 103V tires from the factory, and the mechanic emphasized not to go below this specification when replacing them, otherwise, the tires might blow out when fully loaded. Choosing tires depends on your driving habits – if you frequently drive on highways, you should opt for higher ratings, while regular ratings suffice for city commuting. These parameters are all marked on the tire sidewall, so just pay attention when buying.
