3. Specifications
3.1. ROPS must be designed and made so that, when correctly installed, they substantially reduce the risk of injury to the occupants. The essential features of an efficient ROPS are that it is designed to suit the particular Vehicle, is of sound construction, has adequate mountings and is a close fit to the bodyshell.
3.2. The ROPS must not unduly impede Driver and Co-Driver access to the vehicle. Members may intrude into the interior space by passing through the dashboard, front side trim, rear side trim, and rear seats which may be folded down.
3.3. ROPS must not extend beyond the front upper or rear suspension mounting points of the Vehicle with the exception of backstays which may extend beyond the rear suspension mounting points if necessary to achieve the required 30 ° angle.
3.4. Any modification to a Homologated ROPS( other than fitment of Roof Reinforcement, Windscreen Pillar Reinforcement, Doorbars and Harness Bars) is prohibited.
3.5. Tubes must not carry any liquids or gases, other than air at atmospheric pressure, or any other item.
4. Compulsory Diagonal Member
4.1. Different ways of fitting the compulsory diagonal member are shown in Appendix 13 Diagram 14 and 15. The combination of several members is permitted.
5. Optional Reinforcing Member
5.1. Each type of reinforcement( see Appendix 13 Diagram 16 and 21) may be used separately or combined with others.
6. Technical Specifications
6.1. Main, Front and Lateral Rollbars. These frames or hoops must be made in one piece without joints. Their construction must be smooth and even without ripples or cracks. The vertical part of the main rollbar must be as straight as possible and as close as possible to the interior contour of the bodyshell. The front leg of the front rollbar or a lateral rollbar must be straight or if it is not possible must follow the windscreen pillars and have only one bend unless a windscreen pillar reinforcement is fitted.
6.2. The mounting foot must not be rearward of the foremost point of the rollbar.
6.3. Where the main rollbar forms the rear legs of a lateral rollbar( see Appendix 13 Diagram 15), the connection to the lateral rollbar must be at roof level. To achieve an efficient mounting to the bodyshell, the original interior trim may be modified around the safety cage and its mountings by cutting it away or by distortion.
6.4. However this modification does not permit the removal of the complete parts of upholstery or trim. Where necessary the fusebox may be relocated to enable a rollcage to be fitted.
7. Mounting of ROPS to the Bodyshell 7.1. Minimum mountings are:
a. 1 for each leg of the main or lateral rollbar. b. 1 for each leg of the front rollbar. c. 1 for each backstay.
7.2. Each leg of a main, lateral or front rollbar must be attached, via a mounting foot, by at least three bolts, minimum M8 ISO grade 8.8 and utilising a steel reinforcement plate of a material of at least the same thickness as the wall of the tube to which it is being welded( minimum 3mm) and of at least 120cm2 area which is welded to the bodyshell( see Appendix 13 Diagram 22 to 27).
7.3. The mounting foot or leg may alternatively be welded directly to the bodyshell / reinforcement plate in accordance with Appendix 13 Diagram 22.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 7 Appendix 3- Roll Over Protection Systems( ROPS) 251