4x4 Fender Flare Compliance in Australia

If you’re upgrading your 4x4 with wider wheels and tyres, fender flares often become part of the conversation. They don’t just add a tough look, they’re also a legal requirement in many situations. Whether you’re building a touring rig in Queensland or tackling trails across the country, it’s important to understand how fender flare compliance works under Australia’s Australian Design Rules (ADRs) and various state laws.

This guide walks you through the key compliance rules, state-by-state requirements, penalties, and FAQs to keep you on the right side of the law.

Important Notice

This guide was prepared in September 2025. Vehicle standards, ADRs, and state road rules are subject to change. While we’ve taken care to ensure accuracy, laws and regulations may be updated by transport authorities at any time.

We strongly recommend that you:

• Check the latest guidelines from your state or territory transport authority before modifying your vehicle.
  
• Seek advice from a licensed engineer or accredited compliance workshop if you’re unsure.
  
• Treat this guide as a starting point for your own research, not a substitute for official advice.
  

• Safety: Tyres that stick out can throw stones, mud and debris into traffic. Flares and mudguards stop that and are required by law.
  
• National Standards: Under the ADRs, wheels and tyres must not protrude past the bodywork when viewed from above. If they do, flares or wider guards must cover them.
  
• Insurance & Defects: Driving with exposed tyres can result in a defect notice. Illegal, unsafe or undeclared modifications may create insurance issues, especially if the modification contributes to a crash or increases the insurer’s risk. Always disclose relevant modifications to your insurer and keep records of compliant fitment or certification.
  

The ADRs are the national baseline for all vehicles. For Wheel Flares, three areas matter most:

1. Wheel Coverage: The full tyre width should be covered in plan view, not just the centre tread area.
   
2. Vehicle Width: The overall width (including flares) must not exceed 2.5 m for light vehicles.
   
3. Fitment & Design: Flares must be securely attached, durable, and free of sharp edges. Many state guides require extensions to taper smoothly into the body with rounded edges.
   

While these rules apply nationwide, each state or territory enforces them slightly differently.

Queensland (QLD)

• Tyres must be fully covered by guards or flares.
• Police and TMR inspectors issue defect notices for exposed tread.
• Larger-than-standard wheels/tyres or track increases beyond the allowances generally require certification and a modification plate.
• (Reference: TMR Vehicle Standards & Modifications)

New South Wales (NSW)

• Tyres must be contained within mudguards/flares with the wheels pointing straight.
• Structural changes (widebody kits, significant track increases) may need certification under the VSCCS
• (Reference: Transport for NSW Vehicle Standards)

Victoria (VIC)

• VicRoads requires that no tyre tread is visible outside the wheel arch.
• Significant modifications require approval through the VASS system
• (Reference: VicRoads VSI 8)

Western Australia (WA)

• Any exposed tyre tread is defectable and may attract a yellow sticker.
• WA requirements can differ from other states, so owners should confirm the current WA Department of Transport modification requirements before fitting wider wheels or tyres.
• (Reference: WA Department of Transport Vehicle Standards)

South Australia (SA)

• Mudguards and flares must cover the full width of the tyres.
• SAPOL and DIT issue defect notices for exposed tread.
• (Reference: SA DIT Vehicle Standards)

Tasmania, Northern Territory, ACT

• All require full tyre coverage in line with ADRs.
• Enforcement practices vary, but exposed tyres can still result in defects or roadworthiness issues.
  
  

• Defect Notice: The vehicle must be repaired and re-inspected before it can legally return to the road.
• Fines: Typically between $150–$400 depending on the state and seriousness of the defect.
• Insurance Issues: Claims may be rejected if illegal modifications are found to have contributed to an accident.

Important: flares only solve tyre coverage, not track width

Flares are designed to cover wheels and tyres that sit outside the factory body line. They do not change the vehicle’s wheel track.

For many off-road 4WDs, wheel track must not be increased by more than 50 mm total beyond the manufacturer’s maximum specification unless separately approved. For example, changing from a +60 factory wheel offset to a +35 wheel offset moves each wheel outward by 25 mm, increasing total track by about 50 mm. Changing from +60 to +25 moves each wheel outward by 35 mm, increasing total track by about 70 mm, which may exceed the normal allowance.

Always check offset, tyre diameter, tyre width, clearance and state/territory requirements before assuming a wheel-and-tyre package is legal.

On many off-road type 4WDs, tyres up to 50 mm larger in overall diameter than the manufacturer-specified tyre may be fitted without certification, provided the tyres are covered, do not foul any body, steering, suspension or braking components, and the vehicle otherwise remains compliant. Larger increases may require certification or may not be permitted, depending on the vehicle and state/territory.

Q: What is an example of Offset?
A: If a vehicle has factory +60 offset wheels and you fit +35 offset wheels, each wheel moves outward by about 25 mm. That increases total track by about 50 mm.
If you fit +25 offset wheels, each wheel moves outward by about 35 mm. That increases total track by about 70 mm. Flares may cover the tyres, but they do not reduce the track-width increase

Q: Do I need flares if my tyres stick out only slightly?
A: Yes. Even a small amount of exposed tread can result in a defect.

Q: Can I install flares myself?
A: Yes, provided they’re securely attached, durable, and free of sharp edges. Adhesive alone is not sufficient – they should be bolted or riveted.

Q: Are widebody kits legal?
A: Yes, if they cover the tyres, don’t exceed maximum width, and are securely fitted. Structural modifications generally require engineering approval.

Q: Why is Queensland considered strict?
A; QLD has highly active roadside enforcement. If your build is for daily driving or touring, ensure all tyres are covered, lifts and tyre sizes are within the code, and keep records of any certified modifications.

• Wheel Flares for your 4WD aren’t just cosmetic – they’re required if your wheels extend beyond the factory bodywork.
• If tread is visible from above, it’s not legal anywhere in Australia.
• Properly fitted flares help keep your wheels and tyres covered, which may assist with wheel-coverage compliance. However, flares do not legalise excessive offset or track-width increases. Track width must be checked against the vehicle manufacturer’s factory specifications, including the original wheel offset and approved wheel/tyre sizes.
  
• For a comprehensive guide on selecting the best Flare Kit for your vehicle, Click Here

When it comes to compliant flare kits, Overland Tourers Australia (OTA) kits are your best bet. To our knowledge these kits are the only one's that offer a custom Mud Flap which is an essential to covering your tyre poke the correct way. OTA's Flare & Mud Flap kits continue to grow, as of now they suit the following vehicles:

• 300 Series LandCruiser
• Next Gen Ranger
• 250 Prado LandCruiser