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5 First, we installed the closest to our measurement, which is this rounded style that measured 1-1/2 inches. Next, we jacked up the control arm again until the car started to lift off the jack stand. While this one kept the tire from contacting the wheelwell, it only took a little downward pressure on the fender to collapse it more and induce tire contact. Almost all bump stops are made to compress to lessen the harshness when they are engaged.