The XB8'21 framework features a locking system the servo saver articles that ensures the components will stay secured even during chassis flex in extreme conditions. The gas tank was relocated rearwards for improved fat stability. The chassis fits both SMOOTH and ROUGH composite radio containers without chassis modification. The chassis is CNC-machined from 3mm top-quality Swiss 7075 T6 aluminum; strategically machined in low-stress areas and then anodized to make it since light that you can without impacting energy or rigidity.