I have a 99 z28 and am getting new rims soon, I plan on getting staggered 18's 8.5 fronts and 9.5 rear. I was curious with tire sizes I should go with, I was thinking 245/40/18 fr and 275/35/18rr but was curious if I could or put 315/30/18 on rear or would it be to wide?

Any info would be great thanks.