Tyre size available 255/100 R 16 (9.00 R 16)?

Hi Wolfgang,
You can buy Michelin XZL's in Australia in 255-100R16.
Don't expect to buy them everywhere though. They are a good tyre.
If you need to buy some in Australia, I would try and organise them with a Michelin dealer a few weeks in advance so that they can get them in stock for you
To avoid punctures and problems I would replace them when you have 30% of your tread left. Particularly before you tackle the Kimberleys, Cape York and the Gunbarrel Hwy. If the tyres are Tubeless, get a Tubeless puncture repair kit, Which can be bought in any 4WD shop in Australia, You can fix the tyres with the tyre on the Rim.
If they have tubes, Consider getting tubeless rims if possible for your vehicle or learn how to repair your tyres.
(Its hard work with split rims)
Good Luck with your tour to Australia

WolfgangZ.
There are plenty of small trucks in Aus. so you will always be able to get a tyre that size or 825 16 just to get you out of trouble, the split rims are are a lot easier to repiar than tubless with those heavy side wall tyres. It is unlikely that you will get a nail puncture on an outback track so any tyre problem will envolve removeing the tyre from the rim which is very difficult on the side of the road with tubeless. That style of tyre is very tough as you say, and I think you will have very little trouble if you are a sensable driver. Eric.

Thanks for the info Paul + Eric. That will make me sleep better :-)
Our camper has SDC type split rims, which have a rather small lock ring, that can easily be removed with a screwdriver and mounted by hand. Also you can use tubeless tyres with them and that's what we have. It's quite easy to change them, given you have a real good compressor. Wolfgang