Tyres for 6 stud dual wheel CF1 Motorhome

[Stevo]

The wheels have been sand blasted and painted, and now for the tyres....
The old rags were 650-14" cross ply's with smaller profile radials up front. I'd like to know what is the tallest/biggest tyre I can fit on the 6 inch rims (dual rears). 6.50-14 is equivalent to a 175-14. Very hard to get in a light truck radial. I was thinking of getting some mud tyres for the rears or cross ply's all around, but is seems Otani are the only manufacturer that makes a 6.50-14 cross ply. The Millard Star Craft is about 3.5 tons on a good day. I'd rather go radials, but might have to stick with the Otani cross ply's. It drove quite well with the old tyres but I think it's illegal to have cross ply's and radials on the same vehicle. Can probably go 185-14 or 195-14 but I'm not sure. Your thoughts would be greatly appreciated. 

[LS120]

if it's dual you may find 185 is as wide as you could go as they well rub..

[Stevo]

Yeah thanks LS120 will probably go the 185 radials. That was my concern the tyres rubbing.
I should be able to get the radial width from the tyre place, plus say 50mm for the 3.5 ton load.
Then measure the width of dual wheels up together.
The only misgiving I have is the 650-14 cross plys are probably taller thereby increasing road speed.
Maybe there isn't that much in the height between them.

[Bruce]

I had 185/75/14 radials on my dual wheels, and that's as big as you can go without them rubbing. On the front I ran 215/65/14 on 7" rims which are the equivalent diameter to the rear.  Have just changed the whole setup out to a single axle arrangement and now have all the old tyres and wheels which are still in good condition sitting in the garage.     

[LS120]

i was going to say 75 to 85 profile.. i run 205 x 85 x 14" on my cab-chassis front and back

[Stevo]

Thanks for the info guys. I had my 14" wheels all sandblasted and painted the same green as cab.
Then threw the whole idea out the window and decided to go with Iveco daily 16" wheels on the back (yes they fit the bedford 6 stud PCD) and stay with the 14's on the front.
With 3.5 ton on the back, the 16"s will even up the van since it sits down in the back.
Should help road speed to. I'll let you know how it works out.