I have Challenger 11x20 rims +25 Offset repo Brass Monkeys and 305 Continental Extreme Contact summer tires and I need a 3MM spacer and it rubs ever so slightly on occasion on the inner wheel-well, 5MM spacer eliminates the inner WW interference but it sticks out a smidge. both work but I may bash the bump in the front inside rear wheel-well when I put them back on in the spring with a 3MM spacer.