Can anyone tell me what is the widest wheel I can fit on the front ?

I believe an 11" rim will fit on the rear, but I want to run 335 all around...

 

This is a reply from the king of widened wheels.

 

45835 P305/30ZR-18 M 11.8" 25.6" 80.4" 11-12" 11.0" 13.1"
45840 P335/30ZR-18 M 12.7" 25.6" 80.4" 12-13" 12" 13.6"

Both of these Hoosiers are available in an AutoX and road racing compound. I guess the 305 will have to do...