ddue for an S13 the perfect wheels are 17x9 +15 in teh front and 17x10+25 in the rear 215/45/17 F and 235/40/17R thast stretched to fit on the stock fender unrolled, rolled you can ither run a wider tire at the same offset or you can go 17x9.5F and 17x10.5 R, I know what im talking about. Its all about what tire size your going to run and how much camber. And also the LOWER the offset the more it sticks out you have it wrong, until you are in the negatives, then its higher the negative the farther it sticks out. The reason why your tires probly are close to rubbing is the tire size of 245. if you run a 215, you will be able to see how much more room you have towards the fender, hell you can run a 10 wide tire with that tire size its all about offset, if you get it right the wheel will be in teh same place but the full inch will go inwards towards the suspension.
17x9 with 215/45/17 in the front 17x10+25 with a 235/40/17 tire int he rear, this is UNROLLED, rolled you can ither go wider to 225s up front and 245s in the rear, or rolled you can go with 225s up front and 245s in the rear with a 1/2 inch wider wheels frotn and rear with 6mm lower offset front and rear. dude its not hard i odnt know why no one understands offset of wheels......its so easy.
0 is the perfect center of a set wheel, negative from that is going towards the fender posative it going towards the suspension. .5 of an inch is 13mm's 1inch is 25 mm's.