With my slipstreams, I didn't have to at all.. Because the offset was +42. So they tucked nicely, and I had no issues at all. These wheels were 17x7.5
With my Boyds(+38) I had to roll and pull them a little bit(for as low as I am) to get them to tuck and me to be able to turn fully. These wheels are 18x7, but because of the lower offset they needed to be pulled a little bit, and Honestly, I could still pull more if i wanted to go lower. Right now I'm pondering widening the rear wheels so they are staggered.