How to Identify the Maximum Speed Rating of Passenger Car Tires?
2 Answers
The tire sidewall displays the tire specifications. Generally, tire specifications can be described as: tread width in mm/ aspect ratio (percentage of sidewall height to tread width), R rim diameter in inches, load index, and speed rating. For example: 195/65-R15-88H, where 'H' represents the maximum speed rating. Additional information about car tires is as follows: 1. Car tires limit the vehicle speed, with different tires having varying speed requirements. It is crucial to strictly adhere to the tire's speed limitations while driving, as exceeding them can significantly reduce the tire's lifespan and increase the risk of a blowout. 2. Tires with different speed ratings have different applications. P-T rated tires (maximum speed 150-190 km/h) are suitable for small and compact cars, U-V rated tires (maximum speed 200-240 km/h) are for mid-range to high-end cars, while W-Z rated tires (maximum speed 240-300 km/h) offer better performance and are more commonly used in large luxury cars and supercars.
To check the maximum speed rating of a car tire, start by examining the small characters on the tire sidewall. I usually enjoy delving into these details. There are several numbers and letters on the tire, such as 225/45R17 91V, where the V indicates the speed rating. Standard speed ratings range from A to Y, with A being the lowest at only 5 km/h. Common ratings for sedans include H for 210 km/h and V for 240 km/h. To locate the specific position: crouch down and look at the sidewall, usually near the brand name. The number following the letter is the load index. If you can't remember, use your phone to take a picture of the code and search for an online reference table—I often use car forums to check these tables. Don't confuse old and new tires; when replacing them, always match the original speed rating, as mismatching can affect safety or warranty. Before driving, take half a minute to inspect the tires, ensuring they haven't aged or the codes worn out. This is crucial for high-speed driving safety.
