What does 245/45r18 mean?
2 Answers
The meaning of the car tire 245/45r18 is as follows: 1. 245: 245 represents the tire section width, the unit is mm, generally the width of the tire is between 145 to 285mm, with intervals of 10mm. 2. 45: 45 is the aspect ratio, which is the ratio of the tire sidewall height to the tire section width, 45 represents forty-five percent, the aspect ratio of the tire is between thirty to eighty percent. 3. R: R indicates that the tire has a radial structure. 4. 18: 18 is the outer diameter of the wheel axle, the unit is inches. Additional information: Under normal circumstances, ordinary cars should not use tires with an aspect ratio greater than seventy-five percent, luxury cars and high-performance sports cars are recommended to use tires with an aspect ratio less than sixty percent.
Last time I went to change tires, the mechanic explained the meaning of the numbers 245/45R18 to me. 245 represents the tire width of 245 millimeters—the larger this number, the wider and more imposing the tire looks. 45 is the aspect ratio, which calculates to a sidewall height of approximately 110 millimeters. The smaller this number, the thinner and more sporty the tire appears. R stands for radial construction, which is the standard used nowadays. 18 refers to the wheel diameter of 18 inches, directly impacting the vehicle's visual aesthetics. For my sedan with this tire size, it handles corners quite steadily but can be a bit bumpy on rough roads. Choosing tire specifications really requires balancing comfort and handling.
