Max Std Tyres Disco 1

I think the question you're asking might be better aimed at Landrover themselves .. you seem to be implying that it's against the law to put larger tyres on than standard fitment.

If the question is "what's the largest manufacturer recommended tyre" then the owner's manual is pretty definitive, unless you can obtain better info eg from a local dealer.

If the question is "what's the tyre regulations in my state of Australia" then you're better off on an Aus 4x4 forum, this is a UK site (ending .co.uk) and 95% of people here are from the UK. There may be someone in Aus who browses here and can help you out but it will be more luck than anything else.

The regs allow an increase over the largest manufacturer recommended tyre.
The 4wd community here is pushing to have uniform regulations.
But even so National and State regs give an increase in diameter based on the manufacturers max tyre size.
The Owners manual lists 245/70R16 as the largest alternative does anyone know if there was a larger tyre listed anywhere?
The reason for the question is having a decent Mud terrain tyreand still being covered by insurance.

Thanks