Understanding your tyre sidewall markings is crucial for every car owner. These codes tell you everything about your tyre’s size, performance, age, and more. This guide from Autosport Tyre World helps you decode the numbers and letters on your tyre so you can make informed decisions when buying new tyres.
Why Are Tyre Sidewall Markings Important?
Every tyre carries a wealth of information on its sidewall. Knowing how to read these markings ensures you buy the right tyre for your vehicle, stay compliant with Australian standards, and maintain road safety.
Main Elements of Tyre Sidewall Markings
1. Tyre Size
Example: 205/55R16 91V
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205 – Tyre width in millimetres
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55 – Aspect ratio (height as % of width)
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R – Radial construction
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16 – Rim diameter in inches
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91 – Load index (weight the tyre can support)
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V – Speed rating (maximum safe speed)
2. Load Index & Speed Rating
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Load Index tells you the max weight each tyre can carry.
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Speed Rating is the highest speed the tyre can safely handle.
Check your owner’s manual or ask Autosport Tyre World to make sure your tyres meet your vehicle’s requirements.
3. Manufacturing Date Code (DOT)
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The DOT code ends with four digits. Example: 2423 means the tyre was made in week 24 of 2023.
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Never use a tyre older than six years, as rubber degrades over time.
4. Other Markings
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M+S: Suitable for Mud and Snow
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TWI: Tread Wear Indicator
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E-mark/ECE: Meets European safety standards
How to Use This Information
When you’re shopping for new tyres or checking your current ones, match the size, load, and speed ratings to your vehicle’s specifications. Knowing your tyre’s age also helps you avoid using unsafe, old tyres.
Need Help Decoding Your Tyre?
Bring your car to Autosport Tyre World for a free tyre check! Our experts can read your tyre sidewall markings and recommend the best options for your safety and performance needs.