Quote Originally Posted by androo View Post
I believe the law is not how much bigger your rims are, but the actual rolling diameter. From the RTA:

"Wheels up to 26mm wider than the largest optional wheel recommended by the vehicle manufacturer for the
vehicle can be fitted without the need to notify the RTA.
The outside diameter of the wheel and tyre combination must be no more than 15mm over the largest diameter
wheel and tyre combination specified for the vehicle and not more than 15mm below the smallest diameter wheel
and tyre combination specified for the vehicle." pulled from - http://www.rta.nsw.gov.au/registrati...vsi09_rev4.pdf

Any chance you're running really low profile tires? Not sure what the original profile is so not sure if it's possible to be within this range though. Hope this information helps though.
Interesting... good find!