On the wheel spec, say for a 7" wide wheel, they give you a number like 4/3 or 1/6. This is how many inches of rim are on each side of the center where it seats on the hub. Sometimes they call it "offset". In your post, someone said they like how your wheels put the tires out more for a wider look. That comes from the wheels having more positive back spacing than the stock wheels. If someone has a stock wheel around to measure just lay a straight edge across it and measure to the center from each side and the difference is the offset. If the wheel would stick out more the offset is positive, if it tucks under more it's negative or it may be right in the center. BTW you can measure with the tire on too. it's the difference your after. Bob