So I got a set of new Volk CE28N's which are 18 and I have Kumho XS Series Semi Slick wheels. The car is Ap2 ; and after the installation, the rear tires are the same with front tires ; they are both 225/40/18. Stock rear tires are 245 as you all know ; so would it be a problem to lower the back to 225?

Thanks guys.

 

I'm confused by your post. I run Kuhmo XS tires, what are Kumho XS Series Semi Slick wheels

And I don't understand what advice your looking for, your asking if you can safely run 225 tires in the rear, but you are already running them?

 

Sorry about my english.
I already have wheels installed and Im running them but i am worried about driving with 225 s at rear.

Wheels are Kumho Ecsta XS KU36.

 

You would be better off with the 245/35R18 or 255/35R18 rear but the 225/40R18 on the rear will work fine.