The bead on American tyres is different to the type of tyre fitted to Ferret rims and as the rims are made out of aluminium I wouldn't machine them to fit, but thats just me. In the UK we can still get hold of tyres that will fit the rims it would seem that on the face of it thats harder to find the correct tyre to fit the rims in Australia. Bummer for them
Thanks for taking the time to reply its appreciated.