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Car Tyre Size - How To Read It? - Width, Aspect Ratio, Tyre Construction, Rim Diameter, Load Index

How To Read Car Tire Size? The sidewall of your tire contains important information that helps you understand its size. It is indicated by a series of numbers and letters. For example, a common tire size might be represented as 255/35 R19 96Y. Let's delve into how to read this tire size. Tire Width Number 255 represents the width of the tire in millimeters from sidewall to sidewall when the tire is mounted and inflated to its recommended pressure. In this case, the tire is 255 millimeters wide. A wider tire can provide more contact patch with the road, potentially improving grip and handling. Aspect Ratio Number 35 indicates the aspect ratio. It represents the ratio of the height of the tire's sidewall to its width. In this example, the height of the tire's sidewall is 35% of its width. A lower aspect ratio generally means a shorter sidewall, which can enhance cornering stability and responsiveness, but may result in a firmer ride compared to tires with higher aspect ratios. Tire Construction Letter "R" signifies the construction type of the tire. "R" stands for radial construction, which is the most common type of tire construction used today. Radial tires have ply cords that run radially across the tire from bead to bead, providing flexibility and a smoother ride compared to bias-ply tires. Rim Diameter Number 19 is the rim diameter. It indicates the diameter of the wheel (or rim) that the tire is designed to fit, in inches. In this case, the tire is intended for a 19-inch diameter wheel. It's crucial to match the tire size with the appropriate rim diameter specified by your vehicle manufacturer to ensure proper fitment and performance. Load Index Number 96 is the load index. It is a numerical code that represents the maximum load capacity of the tire when properly inflated and under maximum load. Each load index corresponds to a specific maximum load capacity, which can be found in load index charts provided by tire manufacturers. In this example, a load index of 96 indicates a maximum load capacity of 710 kilograms, which is 1,565 pounds, per tire. Speed Rating Letter "Y" represents the speed rating. It indicates the maximum speed capability of the tire when properly inflated and under load. Speed ratings range from "A" (the lowest) to "Y" (the highest), with each letter corresponding to a specific maximum speed. In this case, a speed rating of "Y" means the tire is rated for speeds up to 300 km per hours, which is 186 miles per hour. Understanding how to read your tire size empowers you to make informed decisions when selecting, maintaining, and replacing tires for your vehicle. Regularly inspecting and maintaining your tires according to manufacturer recommendations helps extend their lifespan and ensures a safer driving experience for you and your passengers.