I have 18x10 +30 and 18x8 +29 GT7s for my coupe.

I plan to drop with 350z H techs or something along that amount (enough that a camber kit wouldn't be needed, but I might do it later on).

What size tires should I run? I don't want to roll the fenders, and if I drop it I figure a 285 will rub. I have noticed that the 40s up front look a little thin. Do many people run 245/45s?

The tires I have been looking at are 275/40/18 and 245/40/18 Falken 452s which are $600US shipped which I think is pretty darn cheap.

Any advice is appreciated.

 

You should probably be okay with a 285/40/18 because your offset is relatively high at +30. I run a 285/35/19 on a 9.5" with a +30 and I clear without rubbing, so you should as well. 245/40/18 is the correct front tire size