Rear anti-roll bar for ball-bearing roll club mounting system and redesigned to utilize the X4 back suspension hands. The anti-roll bar system is installed toward back bulkheads via bearings from outside for extra-smooth movement as well as for quick & effortless modifications and adjustment. The roll club turns in ball-bearings for optimum accuracy and free movement. Anti-roll club height is adjustable via a screwââ¬Â¦ quick & easy. Anti-roll club has laser-engraved stripes (corresponding to bar thickness) for effortless identification.