Exactly. On the rear compressed you have to use a little math. On ride hight measure the distance between axle and bump stops, but since rear shocks are on an angle you can not just subtract that. Draw up a triangle and draw it up at ride height, then make one for compressed. Use A^2+B^2=C^2 to find what you need. Front is as easy as subtracting the distance from the bump stops from the shocks