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What Do the Numbers and Letters on a Tyre Mean?

The sidewall of your tyre is filled with important information. The sequence of numbers and letters, typically in a format like 195/65R15 91H, tells you everything you need to know about your tyre's size, construction, and capabilities. Here's how to break it down


1. Tyre Width (195)

The first number in the sequence represents the tyre's width in millimeters, from sidewall to sidewall. In our example, 195 means the tyre is 195mm wide. The tyre's width affects the car's handling, grip, and fuel efficiency.

2. Aspect Ratio (65)

The aspect ratio is the height of the tyre's sidewall as a percentage of its width. In the example 195/65, the 65 means the height of the sidewall is 65% of the tyre's width. A lower aspect ratio typically offers better handling and stability but may provide a stiffer ride.

3. Construction Type (R)

The letter following the aspect ratio indicates the tyre's construction. R stands for Radial, the most common type of tyre construction today, where the layers run radially across the tyre. This design offers a smoother ride and better fuel efficiency compared to older types.

4. Rim Diameter (15)

The next number tells you the diameter of the wheel (or rim) that the tyre is designed to fit, measured in inches. In our example, 15 means the tyre fits a 15-inch wheel. It's important to match the tyre to the correct wheel size to ensure safe and efficient driving.

5. Load Index (91)

The load index number indicates the maximum load that the tyre can safely carry when properly inflated. In our example, 91 corresponds to a load capacity of 615 kg per tyre. Higher load index numbers mean a higher load-carrying capacity. Always check your vehicle’s manual to ensure your tyres meet or exceed the required load index.

6. Speed Rating (H)

The final letter is the speed rating, which indicates the maximum speed at which the tyre can safely operate. H in our example corresponds to a maximum speed of 210 km/h. Choosing a tyre with the correct speed rating is crucial for safety, especially if you frequently drive at higher speeds.



Why Is It Important to Know Your Tyre Size?

Understanding your tyre size is essential for several reasons:


When Should You Check Your Tyre Size?

You should check your tyre size in the following situations:



How to Find the Right Tyre Size for Your Vehicle

The tyre size information can be found in several places:



Conclusion

Knowing how to read tyre sizes empowers you to make informed decisions about your vehicle's maintenance and safety. At Auto Investments Motor Group, we are committed to helping you stay safe on the road. Whether you need help choosing the right tyres or want to learn more about car care, our expert team is here to assist you.

Visit one of our nationwide dealerships to explore our wide range of vehicles and services, or contact us online for more information. Remember, the right tyres are crucial to your driving experience—don’t leave it to chance!

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