Fender Flares, Tyre Coverage and ADR Compliance
Wider wheels, wider tyres or a different offset can push your tyre outside the mudguarding rules that apply to Australian vehicles. Fender flares bring the guarding back out over the tread. Here's what an inspector or a licensed engineer looks for under the Australian Design Rules and at state roadworthy inspection, and what your flares have to satisfy once they're on your 79.
The tyre coverage rule in plain terms
The rule is short. Your mudguarding has to cover the full width of the tyre tread, and no tyre can stick out past the bodywork or the guards. Look straight down at your ute from above: the guard or flare needs to reach at least as far out as the outer edge of the tyre, right across the tread.
That requirement sits inside the general safety and construction provisions covered by ADR 42/05 (General Safety Requirements), which deals with mudguarding among other construction matters. It's then enforced in service through state and territory roadworthy and registration inspections. Nobody measures your tyres against a single national figure on the day. The inspector checks that guarding covers the tread and that no part of the tyre pokes out past the bodywork.
There are two reasons for it. Guarding keeps the water, mud and stones your tyre throws off other road users and pedestrians, and it lowers the risk of a person or another vehicle touching an exposed rotating tyre. It's a safety and containment rule, not a styling 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 the factory guards are sized to cover exactly that. Change the fitment and the relationship between tyre and guard changes with it. The coverage you started with may no longer be enough.
- Wider tyres. Put a wider tyre on the same wheel and you get a broader tread. That outer shoulder can sit beyond the line the factory guard was drawn to cover.
- Wider wheels. A wider rim changes where the tyre sits and can move its outer edge outboard.
- A more aggressive wheel offset or backspacing. A lower or negative offset pushes the whole wheel and tyre assembly outward, away from the suspension and toward the guard edge. It's one of the most common reasons a tyre ends up poking past the bodywork.
Those are the three changes that move your tyre outboard, away from the centre of the vehicle. Make any one of them, and certainly a combination, and you can leave the outer edge of the tread uncovered or protruding past the factory guard. In that condition your vehicle no longer meets the coverage rule and won't pass a roadworthy inspection.
How fender flares restore compliant coverage
A fender flare is a guard extension. It bolts or fastens to your existing guard and body, and pushes the guarding line outward until it covers the full width of the tread again. If a wider or more aggressively offset package has left your tyre exposed, a correctly sized flare restores the coverage the rule asks for.
You also get the original job of the guarding back. A flare contains the water, mud and stones a wider tyre throws, which would otherwise be flung wider and higher, onto other vehicles and pedestrians and onto your own paint and panels. On dirt and gravel that containment earns its keep well beyond compliance.
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 over a wider rear tyre fitment. If you want the flares to match your body colour, the colour coded front and rear flare set covers all four corners in a finish matched to your paint.
Coverage outcomes by fitment scenario
| Your fitment | What coverage you'll likely get | 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 |
These are common 79 Series scenarios and general guides only. What you actually get depends on your exact wheel width, offset and tyre size, and on the condition of the factory guards on your vehicle.
What the flares themselves must satisfy
- Secure attachment. You have to fix your flare to the guard and body firmly enough that it can't move, vibrate loose or detach in service. A loose or flapping flare is a defect in its own right.
- No sharp edges. The flare can't present sharp edges or dangerous protrusions that could injure a pedestrian or another road user. That reflects the internal and external protrusion principles addressed under ADR 42/05.
- Adequate coverage. The flare has to cover the full width of the tread for the fitment it's paired with. One that's too narrow for the tyre you've fitted doesn't solve anything.
- Sound condition. A cracked, broken or partially detached flare doesn't give you compliant coverage and will be treated as a defect.
Extending coverage is only half of it. Your flare also has to meet the general safety requirements that apply to any external fitting on your vehicle, and an inspector will look at the flare as well as the coverage it gives you. PVS fender flares are matched to the specific vehicle and designed to be plug and play, fitting the factory mounting points and body lines of the 79 Series so the coverage and attachment requirements are met when you've installed them correctly.
State roadworthy and certification
- 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.
Wherever you register the vehicle, in every state and territory, mudguarding and tyre coverage get checked at roadworthy and registration inspection. The national rule is consistent; what varies is the inspection scheme and the point at which a wheel or tyre change needs separate engineering certification. If you're fitting flares to restore coverage after a modest wheel and tyre change, that's often treated as routine maintenance of compliance. A significant change to track width, a large jump in tyre size or a substantial offset change can be a modification that requires certification in its own right, separate from the flares.
For detail on each scheme, read State and Territory Certification Requirements. If you want the background on how the ADRs relate to your in-service obligations, it's in What are Australian Design Rules?. Before you commit to a significant track or tyre change, confirm the requirements with a licensed automotive engineer or a roadworthy inspector.
Vehicle coverage and products
| What you're fitting | What it covers | 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 |
PVS fender flares for the LandCruiser 79 Series are matched to the vehicle and supplied for front and rear fitment. If your wheel and tyre package or build variant isn't a standard fitment, contact our team before ordering and we'll confirm coverage for your offset and tyre width.
Insurance and disclosure
A wheel, tyre or track change alters your vehicle's specification, so tell your insurer about it, along with any flares you've fitted to restore coverage. If your fitment has needed engineering certification, keep the documentation with the vehicle and hand it to your insurer on request.
You can ask us for independent engineering assessment documentation to support your certification and insurance disclosure in any state. Confirm the requirements with a licensed automotive engineer and your insurer, and don't rely on a flare alone to make an otherwise non-compliant fitment legal. We can't promise a specific legal outcome for your fitment. What we can say is that the flares are matched to the vehicle and designed to restore compliant coverage when you've installed them correctly.
Last updated: June 2026