Originally Posted by
Fidelista
If you pack it carefully you can fit within the dimensional restrictions. The same dimensions apply to domestic parcels in Australia, and I've never had a problem sending or receiving frames here, and never had one damaged.
Parcel rates (Australia to US,20kg)
http://auspost.com.au/apps/international-parcel.html
Dimensions
http://auspost.com.au/personal/parcel-dimensions.html
Fedex and UPS have something of a reputation for demanding "Customs charges" etc. before delivery but they usually back down when queried (or so I'm told).
Maybe you should send it to Britain, then post from there to Oz...a British based retailer sends complete bikes in a box to Oz for $AUD107.

No offence to you or other Australians but I never listen to customers in the receiving country in regards to shipping charges. Canadians, Japanese, Australians, green Martians. Never. They all know shipping expensive and they all give a song and a dance.