Straight back uprights keep security in countless track conditions. Improves the management related to vehicle and better keeps it type for improved bump consuming. The uprights are super-strong and show a more substantial outside 8x16x5mm ball-bearing for increased dependability and lifespan. CNC-machined from high-grade Swiss 7075 T6 aluminum Fits XB8, XB8E, XT8, XT8E