Widest possible tire on 18x10.5's?

[CJsV8Bird]

I want to go 255/35 and 335/30. I have had 295's w/ no problems. Is it possible to go that much wider?

Thanks.

 

[94CobraPace]

I have 315-35 on my 10.5 X 17. I have seen the 325 on a 17, not sure about the 18's though.

 

[97RRCOBRA]

You can get the new BFG Drag Radials for the 18's 305 or 315's I think they are.