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Your car tyres are the only point of contact between your vehicle and the road, making them one of the most crucial safety components. Over time, even the best tyres wear down due to regular driving, weather conditions, and road surfaces. Knowing when to replace tyres is essential to maintain performance, handling, and most importantly, safety. In this guide, we explore the signs of tyre wear, safety regulations in Australia, and how to determine the best time for a replacement.
The Need to Replace Tyres
Tyres don’t last forever. They gradually lose tread, develop cracks, and become more susceptible to punctures and blowouts. Driving with worn-out tyres increases the risk of accidents, especially in wet or slippery conditions.
By replacing your tyres at the right time, you ensure:
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Safer braking and cornering
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Improved fuel efficiency
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Enhanced ride comfort
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Reduced risk of tyre failure
According to the roadworthiness guidelines, tyres must have a minimum tread depth of 1.5 mm across the entire surface. Anything below that is considered legally unroadworthy.
How to Know If Your Tyres Need Replacing
Not sure whether your tyres are still safe to use? Here are some key signs to look out for:
• Tread Wear Indicators Are Visible
All modern tyres have tread wear indicator bars built into the grooves. If these bars are flush with the tread, your tyres are worn out and should be replaced immediately.
• Tread Depth Is Below Legal Limit
The legal minimum tread depth in Australia is 1.5 mm, but experts recommend replacing tyres once they reach 2 mm to maintain optimum grip. You can check tread depth using a tread gauge or a 20-cent coin, the outer band of the coin is about 3 mm, so if it's fully visible when inserted, it's time to replace your tyres.
Refer to the Rules for Vehicle Roadworthy Standards in Australia for further guidance.
• Uneven Tyre Wear
Irregular wear on one side of the tyre often indicates issues with alignment, suspension, or inflation. Even if one section has acceptable tread, uneven wear means the tyre’s performance is compromised.
• Cracks, Bulges, or Cuts
Visible damage on the tyre’s sidewall, such as cracks, cuts, or bulges, can lead to sudden blowouts. If your tyres show any of these signs, don’t delay, get them inspected and replaced if necessary.
• Tyre Age
Even if the tread appears acceptable, tyres older than 5-6 years may become hard and brittle, reducing grip. The Department of Infrastructure’s Australian Design Rules (ADR 23) also emphasise the need for safe and compliant tyre conditions. Check the tyre's manufacture date on the sidewall and replace if aged.
Final Thoughts
Understanding when to replace tyres is essential for safe driving. Ignoring worn-out tyres can reduce traction, increase braking distances, and raise the risk of skidding, especially in poor weather conditions. With regular checks and awareness of legal guidelines, you can ensure your tyres are roadworthy and reliable.
Bob Jane T-Marts offers inspections and a wide range of replacement car tyres in Australia, suitable for all vehicles and driving conditions. Visit your nearest store or explore online to find the right tyres and keep your vehicle running safely and smoothly.
References
1) Office of Road Safety- Rules for Vehicle Roadworthy Standards in Australia