this is from
Plus One Tyre Sizing: Learn How To Plus Size Tyres & Wheels
covering Victoria.
Find the link on the page to Victoria.
Contained within is....
The overall diameter of any tyre fitted to a passenger car or passenger car derivative must not
be more than 15mm larger or 26mm smaller than that of any tyre designated by the vehicle
manufacturer for that model.
The overall diameter of any tyre fitted to:
4WD passenger vehicles specifically designed for off-road use (typically MC ADR
category). All wheel drive (AWD) vehicles including those AWD vehicles that may be
certified as MC ADR category, (also commonly known as soft roaders) are not
included in this category;
4WD goods vehicles and their 2WD equivalents if the chassis and running gear are
essentially the same as the 4WD version (N ADR category); or
any medium weight goods vehicle (NA2, NB ADR category).
Must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the
vehicle manufacturer for that vehicle.
Note: Increases in tyre diameter are subject to compliance with all other requirements
specified under this clause (Clause 4.2 Non-Standard Tyres and Rims) and may
therefore be limited by other factors such as insufficient clearance.
Speedometer accuracy must be maintained for the selected tyre and rim combination to within
the degree of accuracy specified in ADR 18 where applicable. It is suggested that the degree of
accuracy is in accordance with the most recent version of ADR18.
My records show your model Forester GT was equipped with 215 60 R16 tyres.
Now, fitting 215 70 R16 tyres has altered the rolling diameter by 46mm which is larger than the specified 15mm.
The 2 inch increase limit does not apply to light SUVs only for full blown off road 4WD.
So, you have given Constable Plod all he needs to issue a defective vehicle notice and your insurance company all they need to decline a claim should you need to make one.
Your tyres foul the suspension and do not fit properly. Please consider reverting back to a standard tyre?