My 8-wheel has 195/75x16 all round. And of course all wheels are interchangeable.
I believe the normal 4-wheel models are 235/65x16 have different rims to mine, but are still 6.5" rim size.
The 235/65x16 tyres should have a diameter of 28" against my 27.5", but 9.3" width against my spindly 7.7".
Has anyone considered a change to 235/65x16 for the front wheels of their 460? I know the spare wouldn't then be correct, but for temporary use should be fine.