Running a 18x9 in front and a 19x10 in the rear. I'm wanting to do this for several reasons. First is that since I'm lowered on just springs, I have a little bit more of a gap in the rear, and almost none in the front...so I was thinking that sticking with an 18" in the front would prevent any bottoming out, but running a 19" in the rear would help fill the gap. If I run a set-up like this, than I would also be saving weight by not having a 19" up front.

My next question is, could I run both tires in a 40 series, or do I have to do a 245/40/18 and 275/35/19? I think that might look a little funny though.

Let me know what your thoughts are on this.

 

Rim diameter has nothing to do with outer tire diameter. Aspect ratio determines the outer tire dimater.

Respect
JET

 

What you said - 245/40/18 and 275/35/19 will work fine... and most likely without rubbing.

Do not run a 40 series on 19s in the rear.

Although, I don't know why you think 18s will prevent bottoming out. 19s will make it appear as though the gap is more filled, simply because there is more metal there. But your overall diameters are going to be pretty close.

I have the same issue as you, almost no wheel gap in front and still a bit of wheel gap in the rear, and I'm running 285/35/19 and lowered on hotchkis.

If you want to get rid of wheel gap completely while keeping correct tire sizes, the only option you have is to lower the car even more.

The only disadvantage to buying 18 front 19 rear is that if you go to sell the rims, that combo may not be as desireable as 19x9 and 19x10.

It won't look weird if you get the right offsets and tires.