The rear is 2 inches narrower than the front from mating surfaces of the wheel. Stock wheels 1+? front and 2 +? rear is the stock offset. The stock rear rim is a 2+ ? for wide rear tire, all of the width on the stock tire goes to the inside, I've done this, I'm no wider on both ends than stock, call Race Line Wheels and tell them what you want to do and they will fix you right up with the right info, I did after many hours of calculations and they confirmed my research, ordered the wheels and perfect, stock width.