So FFR's 818R supplement recommends the following for wheel/tire sizes:
Hoosier A7/R7:
Front 225/40/17
Rear 255/35/18
Toyo R888
Front 215/45/17 (This size requires the front lower arms be mounted for extra caster)
Rear 255/35/18
Yokohama Advan Radial Slicks
Front 210/610/17
Rear 240/640/18
From what I can tell, FFR's gray 818R show car does indeed have 18s on the rear. However, after some searching on the build threads, I see Chad and SixStarCars running 17s on the rear. Plus, Chad went to 235s on the front, and SixStar squeezed 245s on the front.
For a guy who has never bought slicks, what do I need to be thinking about before shelling out money for wheels? Any pros/cons to 18s in the rear vs 17s? I know Chad has talked about rubbing issues on the fenders. Do the 235s/245s really work?