The 235/80R16 is 30.8” in diameter
The 235/85R16 is 31.7” in diameter
So it would make the 235/85R16 .5” bigger all tge way around.
Also the carlisle radial trails are a 12 ply in that size. 10 ply in the 235/80R16
Retail on a 235/85R16 carlisle radial trail 12 ply is roughly $125 thats what we would sell them for at work mounted new valve stems and balanced, just plus $5 tire disposal and tax
The 235/80R16 carlisle radial trail 10 ply is roughly $105