Now the rim pattern (interior) does not matter nor does the tyre tread pattern as those (for me) are easy to change. What is hard is getting a perfectly round object the right (or close enough) size to suit.
I am thinking that the best possibility is the Italeri 'Bigfoot' or Hemmtt kits. These modern type trucks have the wider, fatter type tyre I am after but then again with the mixture of modlers on this site I will look at all offers of help.
Rim/Tyre size one
Over all total diameter = 35mm (this is the outside measurement)
Rim diameter = 14.5mm
Tyre width (thickness) = 11mm
Rim/Tyre size two
Over all total diameter = 35mm (this is the outside measurement)
Rim diameter = 17.5mm
Tyre width (thickness) = 11mm
tyre one is for the rear and tyre two for the front. For those that are interested the real tyre sizes are as follows
Rear = 1400 X 20
Front = 1100 X 24
remember tread pattern and wheel centre pattern do not matter as I will make my own and require the genral correct size to use as the basis of my wheels
serves me right for choosing a 1944 Mack NR 6 X 4 10 ton truck to build with two different size wheels on :-) .
Knowing all you guys will help with suggests etc I wish to thank you all in advance.
cheers
Cliff

PS> Of course when a choise is made I will want to beg, steal borrow or buy two or three of each, preferably the original plastic ones as these are easier to rework then resin copies.
EDIT.....below is two pics, one of the truck and also one of the truck and trailer combo I will be making. Both will be totally scratch built.


I expect to take about 12 months to finish this unit off inbetween other builds.