I'm going to be buying 18x9.5 et 25 all around in a couple days and I'm wondering what size tire should I be using? Anyone running a similar set up? 215/40/18f and 245/40/18r sound about right?

 

I hope you have plans for bodywork...

 

As in a lot of fender flarring and pulling will be involved?

 

Yeah if you wanted wheels that wide, you'd need almost double that offset to fit them, even with fender mods. With those, you'd just about need wider aftermarket fenders.

 

Or should I just run 215 front and 225 rear like most guys running the xxr 521's?

 

Did you seriously not do any research before buying these wheels? They are a very difficult fit, especially with properly sized tires. 255/35/18 is the ideal size for the rear wheels, but you're going to have a hell of a time making them fit. The recommended wheel with for most 225/45/18 tires is 7-8.5". You have 9.5" rears.

So even if you put ill-fitting tires on, you're going to have a hard time fitting them with stock fenders.

 

You will require a lot of pulling and rolling for sure. Not as much if your trying to stretch tire and be "hellaflush". But if you want to fit a nice 255 on there, I would recommend Overfenders in the back.

 

You should get wheels that *fit*. I'd only consider +45 or higher offset.

 

You should go to tirerack.com to purchase your wheels and tires. Type in the car you have and they do all the work for you. The most you'll have to do is a small roll to the rear fenders. You'll end up getting the correct size wheel/offset/tire, and ultimately, no headaches.

 

This. Why even think about putting 215s on a 9.5" wheel?