What does 235/45r18 on a tire mean?

1 Answers
DeAndrew
07/29/25 9:19pm
The meaning of tire 245/40R18: 1. 245: Nominal section width (millimeters) The tire section width refers to the maximum distance between the two outer sides after the tire is inflated as specified, generally divided in 5mm units, but the tolerance for new tire section width is 63%. 2. 40: Aspect ratio (%) The aspect ratio is a tire data that refers to the percentage of the tire's cross-sectional height to its maximum cross-sectional width, simply put, the height-to-width ratio of the tire. 3. R: Tire structure: Radial Radial tires are a type of tire structure, different from bias tires, arched tires, and pressure-adjusted tires. The international code for radial tires is 'R', commonly known as 'steel-belted tires'.
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