Backside anti-roll bar for ball-bearing roll bar mounting system and redesigned to work with the X4 back suspension hands. The anti-roll bar system is mounted on rear bulkheads via bearings from outside for extra-smooth movement as well as for fast & simple modifications and adjustment. The roll club turns in ball-bearings for optimum precision and free motion. Anti-roll club height is adjustable via a screwââ¬Â¦ fast & effortless. Anti-roll bar has laser-engraved stripes (corresponding to bar thickness) for simple recognition.