Rear anti-roll club for ball-bearing roll club mounting system and redesigned to work alongside the X4 back suspension system arms. The anti-roll bar system is mounted on back bulkheads via bearings from outside for extra-smooth motion as well as for quick & simple modifications and modification. The roll club turns in ball-bearings for maximum accuracy and free movement. 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 identification.