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What does 235/55r17-99h mean?

2 Answers

ChaseFitz

07/24/25 10:11am

Here is the explanation of the meaning of 235/55r17-99h: 1. 235: The nominal section width of the tire is 235mm. The section width refers to the maximum distance between the outer sides of the tire when it is properly inflated. 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 number indicates a flatter tire shape. 3. R17: The type is a radial tire, with a rim diameter of 17 inches. 4. 99h: 99 is the load index, and H is the speed symbol. 99 means the maximum load capacity is 775kg, and H indicates a speed limit of 210km/h.

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JulianRose

08/11/25 5:21am

This sequence of numbers appears to be a tire specification. The 235 indicates the tire width is 235 millimeters, the 55 is the aspect ratio meaning the height is 55% of the width, the R stands for radial construction which makes the tire more durable, and the 17 is the rim diameter of 17 inches which is a suitable size. The 99 is the load index indicating a maximum single-tire load capacity of 775 kilograms, and the H is the speed rating allowing a maximum speed of 210 kilometers per hour. Choosing wheels with these specifications will enhance handling stability, especially reducing the risk of skidding during high-speed driving. For daily use, matching the original factory design is crucial—I’ve seen friends use mismatched specifications resulting in higher fuel consumption or a bumpier ride. So when upgrading tires, it’s best to refer to the vehicle manual to ensure compliance with standards and avoid safety hazards. Overall, these specifications balance comfort and performance, making them suitable for family sedans.

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