On my 20th anviversary IRS with 18" wheels, I think while driving I'm getting a max of about 1 1/2" total travel. My body seems to be about 1/8-3/16 off center so if I go over a "dip" in the road, the travel allows for the left rear to just barely rub on the inside of the lip on the drivers side. Now, if I'm only trying to push down on either fenders, I can not really move the car up or down, perhaps 1/4" at the most.