Roll bars are required in all Prepared cars and in all convertible and open cars regardless of class. Roll bars are permitted and strongly recommended in all classes and may be required in the future. A roll bar is a steel one- or two-hoop roll-over protection device, solidly mounted to the structure of the car, and provides two inches of space between the top of the roll bar and the top of the driver’s helmet. Commercially available “harness bars” and “style bars” are not acceptable roll-over protection.
Factory installed roll-over protection on open cars is not acceptable. Specifically, the Porsche Boxster or Boxster S/993/996 convertible system, the Honda S2000, and Mazda MX-5 Miata factory equipment are not acceptable for competitive use. Convertibles may not use removable hardtops as a substitute for roll bars. A competitor may appeal to the Chief of Tech for acceptance of factor-installed OEM roll-over protection. The decision by the Chief of Tech is final.