That won't work Thylo. Austpost's fantastic 'cubic weight' restrictions come into play:

"If the parcel is box-shaped, then its length (its longest dimension) must not exceed 105 cm. The girth, measured around the two other dimensions, must not exceed 140 cm."

So a boxed wheel will be too big at 75cm + 20cm + 75cm + 20cm = 190cm girth.