Guys, just won a set of 17" BBS rims from Germany and need to know what tires to get. I do not know the offset, but the fronts are 8s and the rears are 9s. I know I don't need staggered but I couldn't pass up on the deal. I am getting them shipped to my door for $625. Do I run 235/40s in the front and 255/40s in the rear? I assume the offset is 13 or 15. Thanks.