When choosing new tyres, many Australian drivers focus only on size and price. However, two critical markings on your tyre sidewall are often overlooked — Load Index and Speed Rating.
At Autosport Tyre World, we regularly help customers select tyres that not only fit their vehicle, but also meet safety, legal, and performance requirements.
Here’s a clear guide to understanding tyre load index and speed rating, and why they matter.
What Is a Tyre Load Index?
The load index indicates the maximum weight a single tyre can safely carry when properly inflated.
For example:
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Load Index 91 = 615 kg per tyre
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Load Index 95 = 690 kg per tyre
This means a vehicle with four tyres rated at 91 can safely support up to 2,460 kg in total.
Choosing a tyre with an incorrect load index can:
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Increase tyre wear
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Reduce stability
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Void insurance coverage in some cases
What Is a Tyre Speed Rating?
The speed rating shows the maximum speed a tyre is designed to handle safely.
Common speed ratings in Australia include:
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T – up to 190 km/h
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H – up to 210 km/h
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V – up to 240 km/h
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W – up to 270 km/h
Even if you never drive at these speeds, using a tyre with the correct speed rating ensures proper heat resistance, grip, and handling.
Where to Find Load Index & Speed Rating on Your Tyre
You’ll find both markings on the tyre sidewall, for example:
225/45R17 94W
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94 = Load Index
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W = Speed Rating
Our technicians at Autosport Tyre World always verify these details to ensure compliance with manufacturer recommendations.
Is It Legal to Change Load Index or Speed Rating?
In Australia:
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Load index must not be lower than the vehicle manufacturer’s requirement
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Speed rating should meet or exceed original specifications (with limited exceptions for some 4WD or temporary tyres)
Incorrect ratings may lead to:
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Failed roadworthy inspections
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Reduced insurance protection
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Compromised safety
Why Correct Ratings Matter for Australian Roads
Australian conditions — long distances, high temperatures, and varying road surfaces — place additional stress on tyres.
Selecting tyres with the right load index and speed rating ensures:
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Better braking performance
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Improved tyre lifespan
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Enhanced safety during highway driving
Get Expert Advice at Autosport Tyre World
If you’re unsure which load index or speed rating is right for your vehicle, our team is here to help.
Autosport Tyre World stocks a wide range of tyres suitable for Australian driving conditions, with expert advice to match your car, driving style, and budget.