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How To Read Tyre Measurements

Learn how to read tyre sizes by understanding the alphanumeric codes on the sidewall. These represent width, aspect ratio, rim size, load index, and speed rating, all of which affect vehicle stability, handling, and fuel consumption.

  • 11 Apr 2025
  • 3 min read
  • 40 views

Driving safely in India requires more than just good road sense; it also demands an understanding of your vehicle, including its tyres. Many people may find themselves baffled when they look at the numbers and letters imprinted on the sidewall of their tyres. However, fear not! Deciphering these codes is not as complicated as it seems. We’ll discuss how to read tyre measurements in the next section.

 

How Do You Read Tyre Sizes?

 

To read your tyre size, first look at the tyre's sidewall. You will notice an alphanumeric series representing the tyre's dimensions and specifications. For example, 185/55 R 15 81H.

 

  • The first number (185) is the tyre width in millimetres. It measures the distance from one sidewall to another. The wider the tyre, the more grip and stability it provides, but it also increases the rolling resistance and fuel consumption.

 

  • The second number (55) is the aspect ratio of the tyre. The percentage of the tyre width makes up the height of the sidewall. When the aspect ratio is low, it means the tire's sidewall is shorter and firmer.

 

  • The letter (R) indicates the tyre construction. Here, R stands for radial, the most common type of tyre construction nowadays. Radial tyres have cords that run perpendicular to the direction of travel, which makes them more flexible and durable than other types of tyres.

 

  • The third number (15) is the rim diameter in inches. It is the size of the wheel that fits the tyre. Always match the rim diameter with the tyre size to ensure proper fitment and safety.

 

  • The fourth number (81) is the load index of the tyre. It is a numerical code indicating the maximum weight the tyre can carry at a specified speed.

 

  • The last letter (H) is the speed rating of the tyre. It indicates the maximum speed that the tyre can sustain at a specified load. 

 

Conclusion

 

If you ever wondered how do you read tyre sizes, we hope this has helped. Tyre size is a crucial factor that affects your vehicle's performance, safety, and fuel efficiency. Knowing how to read tyre sizes in India allows you to choose the right tyres for your car or bike that suit your driving style and conditions. Choosing the right tyre size and maintaining it properly can help reduce wear and tear, which in turn can lower potential claims on your car insurance policy for tyre-related issues.


Disclaimer: The information provided in this blog is for educational and informational purposes only. It may contain outdated data and information regarding the relevant industry. It is advised to verify the relevance of the data and information before taking any major steps. ICICI Lombard is not liable for any inaccuracies or consequences resulting from the use of this outdated information

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