ive posted it before but vicroads have a car modification guideline pdf on their site.
http://www.vicroads.vic.gov.au/NR/rd...340/0/VSI8.pdf
If you have a look at section 8 it outlines what you can and cant do with wheels. In regards to diameter it only refers to "wheel and tyre combo" so as mentioned above there doesnt seem to be a limitation on the size of the rim. Just on the overal diameter of the tyre.
As I mentioned above some insurance companies do place limits so it is probably more important to check with them.
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