The 2.5mm chassis made from harder graphite material was developed for very-high traction conditions, or when using tires that offer a lot of steering which makes the car more difficult to drive. This harder chassis makes the car more stable and easier to drive, and eliminates oversteering.
The chassis was redesigned to accommodate the Tweak-Free Pod System and side braces.
The X1'21 chassis continues to offer a wheelbase adjustment using one of three mounting positions for the front suspension. Depending on the installation choice, wheelbase can be selected from the standard length or +/- 4mm alternatives.