The 2.5mm framework created from harder graphite item originated for very-high traction conditions, or whenever using tires offering many steering making the automobile more challenging to push. This harder framework makes the automobile more stable and more straightforward to operate a vehicle, and removes oversteering. The framework had been redesigned to steer the Tweak-Free Pod System and side braces. The X1'21 framework continues to produce a wheelbase adjustment making use of among three mounting jobs leading suspension system. Based on the installation choice, wheelbase are plumped for through the standard size or +/- 4mm choices. Fits X1'21 #371027 X1'21 Graphite Chassis 2.5mm - Hard