Member - TonyG (NSW) replied:

Hi Andrew,

Sorry to say that tyres are banned in Tassie.....................

Just joking

TonyG

Member - JohnR (Vic) replied:

Andrew, it seems ADR24 is the ruler across the nation for fitment if you read the websites. The general indication is 15mm greater diameter fromwhat was said to me on the forum and what seems to be verified.

The piece below is a post from the Toyo web site: www.toyo.com.au/tech_info8.html Sorry the program would not allow me to include the link this time.

Following is a list of the minimum requirements for alternative wheel & tyres for Australian States & territories. These requirements apply to passenger cars unless otherwise stated. O.E. size refers to any tyre size listed on the vehicle's tyre placard. An alternative tyre size is a tyres size that is not listed on the vehicle's tyre placard. Fitment of wheels & tyres that do not meet these requirements require an engineering certificate to be a legal fitment.
New South Wales: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 15mm smaller than the smallest O.E. size. Minimum speed rating is N (140 kph).
Victoria: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size. Minimum speed rating is equivalent to the highest state speed limit, which is 110kph or K.
Queensland: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 26mm smaller than the smallest O.E. size. Minimum speed rating is N (140 kph).
South Australia: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 15mm smaller than the smallest O.E. size. Minimum speed rating is S (180 kph) for new tyres fitted to passenger cars or 140 kph (N) for retreads. Minimum speed rating for four wheel drives is 130 kph (M).
West Australia: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 15mm smaller than the smallest O.E. size. Minimum speed rating is S (180 kph) for new tyres fitted to passenger cars (or the vehicle's top speed if lower than 180kph), or 140 kph (N) for retreads. Minimum speed rating for four wheel drives is N or 140 kph.
Tasmania: No specific ruling in maximum or minimum overall diameters of alternative wheels & tyres, Except that both must comply with Australian Tyre & Rim Association standards. The speed rating must be equal to or better than the vehicle's top speed.
Australian Capital Territory: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size or 26mm smaller than the smallest O.E. size. Minimum speed rating is S (180 kph) for new tyres fitted to passenger cars or 140 kph (N) for retreads. Minimum speed rating for four wheel drives is 140 kph (N).
Northern Territory: The overall diameter of alternative tyres must be not more than 15mm larger than the largest O.E. size. Minimum speed rating is that stated on the tyre placard.

Thanks Toyo