The 2.5mm framework created from harder graphite item originated for very-high traction conditions, or whenever utilizing tires supplying numerous steering making the car tougher to push. This harder framework makes the car more stable plus much more user friendly a vehicle, and removes oversteering. The framework was at reality redesigned to guide the Tweak-Free Pod System and side braces. The X1'21 framework continues to create a wheelbase modification using among three mounting jobs leading suspension system system. In line with the installation option, wheelbase are plumped for through standard size or +/- 4mm options. Fits X1'21 #371027 X1'21 Graphite Chassis 2.5mm - Hard