Backside anti-roll bar for ball-bearing roll club mounting system and redesigned to work with the X4 rear suspension system hands. The anti-roll club system is mounted towards the back bulkheads via bearings from outside for extra-smooth movement and for quick & easy changes and adjustment. The roll club turns in ball-bearings for maximum precision and free movement. Anti-roll club height is adjustable via a screwââ¬Â¦ fast & effortless. Anti-roll club has laser-engraved stripes (corresponding to bar depth) for simple identification.