I am going to order some new rims for my car, and I know I want 18x10 deep dish rims in the back, probably 18x9s in the front. I need to figure out what size tires to fit on these rims to run properly. I was thinking a 285 or 295 on the back, I know diff manufacturers tires will have diff treadwidths with the same 285mm rating for instance. Right now I have 17x9s on the back with P275/40/ZR17 nitto 555s and they bulge out a bit. I've been doing alot of reading about roadracing type setups and everything tells me to not have a treadwidth wider than the rim width, being as 10inches = 254mm I can't see how the rating on the sidewall could be exactly equal to the treadwidth, so I'm going to have to get a ballpark and lookup specs on the manufacturers sites. I've been looking at toyo T1Rs, and nitto. Any one with similiar rims have any advice? These are on a 1995 mustang GT, lowered w/ FMS C springs, couple other mods nothing pertinent to this question though.
-J