Lightweight yet ultra-strong backside upright molded from special graphite composite product. Features bigger outside 8x16x5mm ball-bearing for increased reliability and life-span. Graphite rear upright is extremely strong and makes the trunk of vehicle extremely stable, yet is very light using some load from the rear suspension system. Improves bump taking in and handling on bumpy tracks. To extend the set-up alternatives, yet another reduced roll-center adjustment place ended up being added. Suited to most track conditions, especially for medium- and high-traction songs. The smart design allows equivalent upright to be utilized on both remaining & right sides. The low suspension pin where a corner upright sits features 2 shims for wheelbase modification. The trunk upright features integrated geometry adjustments including: camber, upper and lower roll center and wheelbase.