How to Understand Tire Model Numbers?

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Automobile tire model numbers are generally represented by numbers and letters, such as 225/60-R17-99H, where 225 represents the section width, 60 represents the aspect ratio, R represents the tire type code, 17 represents the rim diameter, 99 represents the tire load index, and H represents the tire speed rating. Additional information: 1. Types of tires include: International standard tire codes, which indicate the section width and aspect ratio percentage in millimeters. This is followed by: the tire type code, rim diameter (in inches), load index (permissible load-bearing mass code), and permissible vehicle speed code. For example: In 175/70R1477H, 175 indicates the tire width is 175MM, 70 indicates the tire's aspect ratio is 70%, meaning the section height is 70% of the width, the rim diameter is 14 inches, the load index is 77, and the speed rating is H. 2. If you encounter tires with the suffix XL, it stands for 'Extra Load' tires. For example, 205/60R16-96H-XL has the same size specifications as the aforementioned tire, but with a load index of 96 (710 kg) and a speed rating of H (210 km/h).