Okay so I'm looking to get some 18's from Tire Rack and the recommended tire size is 215/40-18...

Now I really want to try to minimize the 4X4 look as much as I can until I get some Eibachs, but will a 225/40-18 tire work as well?

I know basically nothing about this type of thing and just want to make sure... props

$YM$

 

I'm not sure if it will work, but the tire you have listed is 1 centimeter wider, which will give the tire about 4 millimeters more sidewall.

 

When replacing the stock tires 225-40r18 are often the preferred size because of better tire selection and prices.

 

You could put on 235 or iv heard rumers of 245 but theres some rubbing involved lol.

 

The stock SS/SC tire is a 215/45r18. Your recommended tire of 215/40 is smaller, and being put on a base model suspension, which has more clearance. So it will absolutely fit.

Your requested tire of a 225/40 will also fit without a problem.

Sidewall height of each:

215/45 = 96.75 MM
215/40 = 86.0 MM
225/40 = 90.0 MM

As you can see, the SS/SC stock set up has the overall largest diameter. You next concern is the width. Going up one size width (215 to a 225) is fine. You won't rub. Don't go any higher.

I personally recommend 215 (8.46 inches) on a 7" wide wheel, and a 225 (8.85) on a 7.5".