What is the size of an R18 tire?

1 Answers
DelJeremiah
07/30/25 10:50am
R18 refers to what is commonly known as an 18-inch tire, and there are many specifications for 18-inch tires. The tire size "225/50R18" indicates a tire with a cross-sectional width of 225mm, an aspect ratio of 50% (the percentage of tire height divided by tire width), a radial tire, and a diameter of 18 inches. Here is an example to explain the meaning of the numbers and letters in a tire model: 225/60R17 99H. 1. 225: Represents the section width, simply understood as the width of the tire tread. 2. 60: Represents the aspect ratio, simply understood as the height of the tire sidewall. 3. R: Represents the tire type code, where R stands for radial tire. 4. 17: Represents the rim diameter, meaning the tire is suitable for 17-inch rims. 5. 99: Represents the tire's load index, indicating the maximum weight the tire can bear. A load index of 99 means the tire can bear a maximum weight of 775KG. 6. H: Represents the tire's speed rating, indicating the maximum speed the tire can handle. A speed rating of H means the tire can handle speeds up to 210KM/H.
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