Clause 160, explains it�s use.
160. There is no mandatory requirement for a CIK Crash-Tested and Homologated rear protection system for National events. For all classes except Cadets a CIK Crash-Tested and Homologated rear protection system in accordance to the CIK regulations may be used in lieu of a rear bumper, but only for CIK chassis homologated from 1.1.2006, or chassis compliant with the post 2006 CIK Chassis Regulations.
So, for all but post 2006 CIK Homologated chassis it�s illegal.
The big question is;
If you use a CIK rear bumper are you still subject to this rule?, as they tend to be wider than the steel ones
162. The rear bumper must: Have an overall width not exceeding the rear width of the kart at any time (measured to the outside of the rear wheels or tyres, whichever is the greater).
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