I have a 2007 base Z, running 18" stock wheels right now and I want to upgrade but I also want to keep close to these stock parameters...so the configuration I'm interested in is:

FRONT 18" x 8.5", Offset +15 to +25, Tires 245/40/18
REAR 18" x 9.5", Offset +15 to +25, Tires 275/40/18

I am looking at the Axis S5:F wheels (see pic)... BUT they don't seem to make 18 x 9.5 for the REARs ... only 18 x 8.5's. Is this correct?... Am I missing something here??...Any other 18" configuration possible?...If this is not an option, then... would bumping up to 19" be that much of a difference in terms of handling?... would they feel much more "heavier" in steering than the 18"?

I'm a newbie here... so any help/suggestions would be great...thanks!

 

Not exactly. Wheels are wheels. You can put them on the front or rear. There is no dedicated front wheel or dedicated rear wheel.

 

yes, but if i need to keep to the suggested configuration, don't I need 18 x 9.5 for the rears?.... NOT 18 x 8.5 ??

 

no, the 275 will fit fine a 8.5" rim

 

ooooh..ok, thanks.

and back to the second part of my question:... would bumpin up to 19's be THAT much different, in terms of handling compared to the 18's wheels? (btw...im not doing any track use)

 

No. There is no need to stagger wheels. You can run the same size all around.

 

No. Wheel diameter is insignificant. Tires matter.