Originally Posted by BoilerUpXFire

The rears will need pretty large spacers, at least 15mm, the fronts should be close. I would advise against going with 20s on the front, I did on my last XF and the tire profile is so small that if you have a loss of pressure, as I did, there is no time and you are in for a ride, I totaled mine.

I did an 18/20 stagger on my current car and really love the look, plus it keep the natural rake from the factory that really helps the car look perfect. My old rims were very similar, here is a photo...