South Australian Numbered Regulations South Australian Numbered Regulations48—Pneumatic tyres—carcass construction
(1) A vehicle must not have pneumatic tyres of different carcass construction fitted to the same axle, but the tyres may have different cord materials and a different number of plies.
(2) However, subrule (1) does not apply to a tyre being used in an emergency as a temporary replacement for a tyre complying with the subrule.