Lyla Lindsey
In Australia, there are several laws regarding tyres that, if not followed, can result in a fine or other legal consequences. These laws include standards for tread depth, puncture repairs, and the positioning of tyres in relation to the vehicle's body work. Tyres in Australia must also meet specific test standards for issues like chunking and tyre strength. This article will explore each of these laws in detail, providing clarity on the legal requirements for tyre usage in Australia and the potential consequences for non-compliance.
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Tyre tread depth
In Australia, it is essential to maintain the correct tyre tread depth for road safety and to ensure your vehicle remains legal. Tyre tread depth is one of the most important factors when assessing the condition of your tyres. It is recommended to check your tyres regularly to ensure they are above the legal minimum tread depth.
The legal minimum tyre tread depth in Australia is 1.5mm across the entire width and circumference of the tyre. If any section of the tyre falls below this minimum, the tyre is illegal to drive on, and you may face penalties. It is important to note that tyre tread depth is crucial for safe driving, as it improves your ability to brake hard or accelerate quickly in dangerous situations.
To measure tyre tread depth, you can use wear indicators, which are identified on MICHELIN tyres by a small Michelin man symbol. When the tread wear level reaches these indicators, it is time to replace your tyre. Tyrepower, an Australian tyre company, recommends changing your tyres at around 3mm of tread depth to maintain optimal performance and safety.
Driving on tyres with insufficient tread depth can be dangerous and impact your vehicle's performance. For example, if you are travelling at 80km/h on a wet road and brake with a new tyre (8mm tread depth), your car will stop comfortably with little risk of aquaplaning. However, if your tyre tread depth is only 3mm, your vehicle will still be moving at 30km/h when the car with new tyres would have stopped, and it will then continue for another 9.5 meters. Therefore, it is crucial to maintain adequate tyre tread depth for safe driving.
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Tyre chunking
- Suspension issues: Worn shock absorbers can cause the tyre to bounce on the road, leading to chunking as the tyre slams back into the road.
- Heat: Tyre chunking can occur when tyres are not properly warmed up before being subjected to severe stress, such as on a race track or autocross course.
- Overuse: Using tyres beyond their recommended mileage or lifespan can lead to chunking.
- Load rating: If a tyre is not rated for the loads it regularly carries, it can lead to chunking.
- Seasonal usage: Using winter or all-season tyres during the summer can cause chunking.
- Manufacturing defects: In some cases, tyre chunking may be due to manufacturing defects or poor quality control.
In Australia, it is illegal to drive with tyres that protrude past the body work of the vehicle. This is a safety hazard and can result in a defect notice. It is important for vehicle owners to regularly inspect their tyres for any signs of damage or chunking and replace them if necessary. Puncture repairs and tyre tread depth must also meet Australian standards to ensure safe driving conditions.
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Tyre separation
Tyre tread separation is a type of tyre damage that can compromise your vehicle's safety. It occurs when the patterned outer layer of a tyre, or the tread, separates from the rest of the wheel. Treads are the parts of tyres that are in direct contact with the road, and they have patterns that channel dust and water away from the wheel to maintain traction and prevent slipping and hydroplaning. Tyre tread separation can cause a loss of traction, deflation, or tyre blowouts, which can endanger you and other road users.
There are several causes of tyre tread separation. One of the main causes is the natural degradation of tyres over time, especially when used for extended periods and distances. Incorrect repairs can also lead to rapid tread separation, as service technicians may inadvertently puncture your tyres. Tyre manufacturers may also use faulty materials or improper production practices, resulting in premature separation.
Other driving practices can also contribute to tyre tread separation. Drifting, excessive braking, and fast driving can overheat and detread tyres. Underinflated tyres, which have a pressure (PSI) lower than the manufacturer's recommendation, are more susceptible to wear and tread separation as they cannot optimise traction. Overloading your vehicle with items or passengers that exceed the weight capacity of your tyres can also place unmanageable stress on the rubber, leading to overheating and uneven weight distribution, potentially causing tread separation.
It is important to be able to identify the signs of tyre tread separation to avoid driving with faulty tyres and potentially causing accidents. Bubbles or bulges along the tyre's sidewall, cracks on the tyre surface, and vibrations during your drive, even at moderate speeds, are all indications of tread separation. Tyre tread separation can be identified by bulges in the tyre, localised wear above the separated region, or a groove worn along the shoulder. The only fix to a separated tyre is to replace it. Continuing to drive on a separated tyre increases the risk of a crash due to a blowout.
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Tyre protrusion
This regulation is in place to ensure that the wheels are entirely within the bodywork when viewed from above and when the wheels are facing straight ahead. The specific legislation is outlined in ADR 42, which states that "the wheel and tyre must be effectively covered by the guard".
Some people attempt to get around this regulation by extending their body panels to cover the wheels, but it is unclear whether this makes the vehicle legal. It is always best to consult with local authorities or law enforcement agencies to clarify the specific requirements and ensure your vehicle is roadworthy and compliant with all relevant laws and regulations.
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Tyre repair standards
Tyres must also have their specifications, such as size, construction type, speed rating, load rating, and date of manufacture, clearly printed on the sidewall. Asymmetrical tyres must include an arrow indicating the correct direction of fitment. Additionally, tyres must have at least four evenly spaced tread wear indicators, signalling when the tread depth reaches 1.6 mm or less, rendering the tyre unsafe for the road.
When replacing tyres on passenger vehicles, the new tyres' dimensions must not deviate more than 15 mm from the tyre sizes listed on the car's placard. This ensures that the load rating and speed rating match the manufacturer's specifications, maintaining the safety of the vehicle. Furthermore, tyres mounted on the same axle must be of identical construction and size as the original tyres.
The Tyre and Rim Association of Australia also plays a role in maintaining tyre standards. They publish an annual Standards Manual, providing comprehensive technical data and industry standards for tyres and rims. This manual covers various topics, including dimensional specifications, recommended tyre and rim combinations, load and inflation tables, inspection standards, and more. The manual is updated annually to incorporate the latest advancements and global standards.
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Frequently asked questions
Yes, motor vehicles in Australia are subject to many complex safety standards, and tyres are no exception. Tyres must have adequate tread depth. If your tyres are worn to the tread wear indicators (TWI) – 1.6mm or below – they must be replaced.
The ADR specifies the labelling and construction standards of tyres fitted to Australian cars. Every tyre must meet the requirements of ADR 23 before being fitted to a new or used car. Tyres must also meet several test standards, including resistance to bead unseating and tyre strength, tyre endurance, and high-speed performance.
Yes, the wheel and tyre must be effectively covered by a guard. It is illegal for tyres to protrude past the body of the vehicle or the guards.
