It is important that all (4) wheels maintain contact with the floor at all times. So leaning the chair back by causing the front wheels to come off the floor is not permissible. HOWEVER, rear lean (seat dump) may be achieved by making the front legs an inch-or-so longer than the rear legs, using the adjustment holes and spring pin buttons in the telescoping legs. The maximum recommended angle of tilt (seat relative to the floor) is 4-8 degrees.