Rub Anxiety

[Anthony]

235/40 on an 18x8. I don't even want to come close to rubbing (I plan on lowering the car later). Could I go even bigger on the tires?

 

[barch88]

235/40 you won't rub, unless you lower it on coils and go for the slammed look (springs you'll be fine). I would stick to 235/40 a 45 sidewall would be a bit thicker and since you're running 18's you may rub. Some 18's even run 35 sidewalls.

 

[Thaifight-R]

It really depends on the offset of the wheels.

You can play around with this for an idea of how the wheels will fit. Use 85 for the fender distance to hub.

http://www.jonathanrowny.com/page/offset-calculator

 

[Anthony]

It really depends on the offset of the wheels.

You can play around with this for an idea of how the wheels will fit. Use 85 for the fender distance to hub.

Wheel Offset Calculator - The Ultimate Stance Calculator | Jonathan Rowny

I think it said 35-40mm offset depending on size. I'm going for the 18x7.5 so I don't know which end of the spectrum that would fall under.

 

[Thaifight-R]

Hmm, in that case, pretty much what barch said.
According to the calculator, it will be pretty darn close to/flush with the fender, but you should be OK if you're not trying to slam your car.
Try to go with the slightly higher offset ones if you can. et 35 according to the website seems to be cutting it close. (although of course, do remember that this is only an estimation)