Fender Flares, Tyre Coverage and ADR Compliance
This page explains the mudguarding and tyre coverage rules that apply to Australian vehicles, why fitting wider wheels, wider tyres, or a different wheel offset can put your vehicle outside those rules, and how fender flares restore compliant coverage. It covers the general safety and mudguarding requirements addressed under the Australian Design Rules and enforced through state roadworthy inspections, what an inspector or licensed engineer looks for, and the practical fitment requirements that flares themselves must meet.
The Tyre Coverage Rule in Plain Terms
The rule is straightforward. A vehicle must have mudguarding that covers the full width of the tyre tread, and the tyres must not protrude beyond the bodywork or the guards. In practice this means that when you look down at the vehicle from directly above, the guard or flare must extend out at least as far as the outer edge of the tyre across the full width of the tread.
This requirement sits within the general safety and construction provisions covered by ADR 42/05 (General Safety Requirements), which addresses mudguarding among other vehicle construction matters. It is then enforced in service through state and territory roadworthy and registration inspections. An inspector does not measure your tyres against a single national figure on the day. They check that the tyre is covered by guarding across its tread and that no part of the tyre sticks out past the bodywork.
The purpose of the rule is twofold. It protects other road users and pedestrians from the spray of water, mud, and stones thrown up by the tyre, and it reduces the risk of a person or another vehicle making contact with an exposed rotating tyre. It is, at its core, a safety and containment rule rather than an aesthetic one.
Why Wider Wheels and Tyres Create a Problem
A factory Toyota LandCruiser 79 Series is built and assessed with its standard wheel and tyre package, and its factory guards are sized to cover that package. The moment you change the wheel and tyre fitment, the relationship between the tyre and the guard changes, and the factory coverage may no longer be adequate.
Three common changes push the tyre outboard, away from the centre of the vehicle and toward or past the edge of the factory guard:
- Wider tyres. A wider tyre on the same wheel has a broader tread. The outer shoulder of that tread can sit beyond the line the factory guard was designed to cover.
- Wider wheels. A wider rim changes where the tyre sits and can move the outer edge of the tyre outboard.
- A more aggressive wheel offset or backspacing. A wheel with a lower or negative offset pushes the whole wheel and tyre assembly outward, away from the suspension and toward the guard edge. This is one of the most common reasons a tyre ends up poking out past the bodywork.
Any one of these changes, and certainly a combination of them, can leave the outer edge of the tyre uncovered or protruding past the factory guard. At that point the vehicle no longer meets the coverage rule and will not pass a roadworthy inspection in that condition.
How Fender Flares Restore Compliant Coverage
A fender flare is a guard extension. It bolts or fastens to the existing guard and the body and extends the guarding line outward so that it once again covers the full width of the tyre tread. Where a wider or more aggressively offset wheel and tyre package has left the tyre exposed, a correctly sized flare restores the coverage the rule requires.
Flares also restore the original purpose of the guarding. They contain the water, mud, and stones thrown up by a wider tyre, which would otherwise be flung wider and higher, onto other vehicles and pedestrians and onto your own paintwork and panels. For a vehicle that spends time on dirt and gravel, this containment is a practical benefit as well as a compliance one.
For the rear of the 79 Series dual cab, the rear raw black fender flares for the LandCruiser 79 Series dual cab are matched to the vehicle and extend the rear guarding line to cover a wider rear tyre fitment. For owners who want the flares to match the body, the colour coded front and rear flare set provides coverage at all four corners with a finish that matches the vehicle's paint.
Coverage Outcomes by Fitment Scenario
The table below sets out common 79 Series fitment scenarios, the likely coverage outcome, and whether flares are needed to restore compliant coverage. These are general guides only. The actual outcome depends on the exact wheel width, offset, tyre size, and the condition of the factory guards on your vehicle.
| Fitment scenario | Likely coverage outcome | Flares needed |
|---|---|---|
| Factory wheels and factory size tyres | Tyre sits within the factory guard line, fully covered | No |
| Factory wheels, slightly taller tyre of the same width | Width unchanged, coverage usually retained | Usually no, confirm on the vehicle |
| Wider tyre on factory wheels | Outer tread shoulder may sit beyond the factory guard | Likely yes |
| Wider aftermarket wheels, same tyre width | Tyre moved outboard, outer edge may pass the guard | Likely yes |
| Aggressive negative offset or reduced backspacing | Whole assembly pushed outward, tyre often protrudes past the bodywork | Yes |
| Wider wheels and wider tyres combined | Significant outboard movement, tyre tread uncovered | Yes |
What the Flares Themselves Must Satisfy
Fitting a flare is not only about extending coverage. The flare itself must meet the general safety requirements that apply to any external fitting on the vehicle. An inspector will check the flare, not just the coverage it provides.
- Secure attachment. The flare must be securely fitted to the guard and body so that it cannot move, vibrate loose, or detach in service. A loosely fitted or flapping flare is a defect in its own right.
- No sharp edges. The flare must not present sharp edges or dangerous protrusions that could injure a pedestrian or another road user. This reflects the internal and external protrusion principles addressed under ADR 42/05.
- Adequate coverage. The flare must actually cover the full width of the tyre tread for the fitment it is paired with. A flare that is too narrow for the tyre it is meant to cover does not solve the problem.
- Sound condition. A cracked, broken, or partially detached flare does not provide compliant coverage and will be treated as a defect.
PVS fender flares are matched to the specific vehicle and designed to be plug and play, fitting to the factory mounting points and body lines of the 79 Series so that the coverage and attachment requirements are met when the flares are installed correctly.
State Roadworthy and Certification
Mudguarding and tyre coverage are checked at roadworthy and registration inspection in every state and territory. The national rule is consistent, but the inspection scheme and the threshold at which a wheel or tyre change requires separate engineering certification vary by jurisdiction.
Fitting flares to restore coverage for a modest wheel and tyre change is often treated as routine maintenance of compliance. However, a significant change to track width, a large increase in tyre size, or a substantial offset change can be a modification that requires engineering certification in its own right, separate from the flares.
- NSW: Wheel and tyre changes beyond the light vehicle modification limits may require certification under VSCCS. Mudguarding and tyre coverage are checked at inspection.
- VIC: Significant track or tyre changes may require VASS certification. Coverage is assessed against the mudguarding requirements at inspection.
- QLD: Larger wheel, tyre, or track changes may require certification by an Approved Person under the scheme administered by TMR. Contact TMR for guidance on your specific fitment.
- SA, WA, TAS, NT, ACT: Refer to the relevant state or territory scheme for the thresholds that apply to wheel, tyre, and track modifications.
See State and Territory Certification Requirements for detail on each scheme, and What are Australian Design Rules? for background on how the ADRs relate to your in-service obligations. For any significant track or tyre change, confirm the requirements with a licensed automotive engineer or a roadworthy inspector before you commit to a fitment.
Vehicle Coverage and Products
PVS fender flares for the LandCruiser 79 Series are matched to the vehicle and supplied for both front and rear fitment.
| Product | Coverage | Finish |
|---|---|---|
| Rear raw black fender flares, 79 Series dual cab | Rear guarding extension for wider rear tyre fitment | Raw black, ready to paint or run as is |
| Colour coded flares, front and rear | Full coverage at all four corners | Colour matched to the vehicle's paint |
If your wheel and tyre package or build variant is not a standard fitment, contact our team before ordering so that coverage for your specific offset and tyre width can be confirmed.
Insurance and Disclosure
Wheel, tyre, and track changes are changes to your vehicle's specification that should be disclosed to your insurer, along with any flares fitted to restore coverage. Where a fitment has required engineering certification, keep the certification documentation with the vehicle and provide it to your insurer on request.
Independent engineering assessment documentation is available from PVS on request to support certification and insurance disclosure in any state. Always confirm requirements with a licensed automotive engineer and your insurer, and do not rely on a flare alone to make an otherwise non-compliant fitment legal. We cannot promise a specific legal outcome for a given fitment, only that the flares are matched to the vehicle and designed to restore compliant coverage when installed correctly.
Last updated: June 2026