I have an 06 350z, lowered on some tein springs with 30mm wheel spacers in the rear and 25mm in the front. I have 18x8.5 in the front with a 225/45 and 18x9.5 in the rear with a 245/45 but my rear tires are completly bald and am trying to order new ones but want a bigger tires in the rear now sure what size will look good keeping the 225/45 in the front.

 

275/40/18

 

275/40-18 rears should be fine

 

Your 18x9.5” wheels will easily fit a 275/40-18” tire. Go with that rear size and don’t worry about the 225’s in the front.

When you replace the fronts, go with 245/40-18” tires.

--Spike

 

am i gonna have to roll my fender?

 

Depends on the offset of your rear wheels, but with a 30mm spacer it's gonna be close.

 

You probably will not need to roll the fenders; but if the tires do rub, simply replace the spacers with a different size. --Spike

 

Thanks guys!