What does 225/55r18/98h mean?

2 Answers
LeHadley
07/24/25 9:49am
225/55r18/98h has the following meanings: 1. 225: The nominal section width of the tire is 225mm. The tire section width refers to the maximum distance between the outer sides of the tire when inflated to the specified pressure. 2. 55: The nominal aspect ratio of the tire. The aspect ratio refers to the percentage of the tire's sidewall height relative to its width. A smaller value indicates a flatter tire shape. 3. R18: The type is a radial tire, with a rim diameter of 18 inches. 4. 98h: 98 is the load index, and H is the speed symbol. 98 indicates that the maximum load capacity is 750kg, and H indicates that the maximum speed limit is 210km/h.
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VonAdriana
08/11/25 5:03am
Hey, talking about the tire specification 225/55R18/98H, I find it quite interesting. The 225 refers to the tire width of 225 millimeters, which affects grip and cornering stability. The 55 is the aspect ratio, meaning the sidewall height is 55% of the width. A smaller number indicates a flatter tire, which offers better handling at high speeds but sacrifices some comfort. R18 stands for an 18-inch rim diameter, with the R indicating a radial structure, a common and more durable design. The 98 is the load index, with each tire capable of carrying approximately 750 kilograms, ensuring the vehicle doesn't exceed its load capacity. H is the speed rating, indicating a maximum speed of 210 kilometers per hour—so you need to be careful when driving fast. This specification is common on SUVs or family cars, striking a balance between handling and comfort. For daily maintenance, remember to check tire pressure and wear to avoid mismatched specifications affecting driving safety. Like my friend who had some minor issues after randomly changing tires, so understanding these numbers is indeed important.
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