Wheel Spacers are perfect for those who want to give there car a more aggressive stance without buying a whole new set of wheels for their car. We often get asked, “What size spacer do I need to get my wheels to be flush?”. Here is a quick way to get yourself a ball park measurement.
Grab a long straight edge (piece of wood, even a cardboard box) and a tape measure/ruler. Hold the straight edge against the fender and straight down. Then measure the distance between the wheel/tire and the straight edge. I always measure from whatever point sticks out furthest. In this case, the rim since the tires are stretched.
So as you can see, if I want this rim to be in line with the fender, I need a 10mm spacer.