b.
c.
A centre roof bar must be installed either diagonally or evenly spaced in line with the exterior longitudinal bars as shown in Ch. 7 App. 13 Diagram 56. If more than one centre bar is fitted the bars must be evenly spaced. Double crossed roof bars to the minimum specification for optional members are strongly recommended as shown in Ch. 7 App. 13 Diagram 19.
It is recommended that a horizontal bar be incorporated in the front hoop located approximately in line with the base of the windscreen which may be bolted or welded to the front hoop members and shall comply with the specifications for an optional member at Arts. 12.1 – 12.7 below.
11.3. Vehicles with Chassis: These employ a separate Chassis structure from the body or superstructure.
a. They must mount their roll-cage directly to the Chassis in accordance with Ch. 7 App. 13 Diagram 41 following the principles of Ch. 7 App. 3 Art. 7. b.
c.
d.
e.
Exceptionally where the body contains a superstructure of internal steel pressings including the floor and the roll-cage is ASN / FIA certified it is permitted to install the roll-cage in accordance with Arts. 11.2 above.
Where it is necessary to weld additional Chassis outriggers on which to mount the roll-cage these must be of at least 75x50mm box section steel and not less than 3mm thick.
Alternatively the main hoop may be constructed as in Ch. 7 App. 13 Diagram 40 allowing mounting to the main Chassis rails or as in Ch. 7 App. 13 Diagrams 53 and 54 where a beam is welded across the Chassis rails. This beam must comply with Art. 11.3. c above.
Where the roll-cage passes through the superstructure’ s floor panels two alternative methods may be employed:
i.
ii.
Either oversize holes allowing uninterrupted passage of the tubes to the chassis placed so as to allow for the movement of the superstructure where this is rubber mounted to the chassis or Or spreader plates complying with Ch. 7 App. 3 Arts. 3.2 – 3.5 may be used to sandwich the floor where the cage structure is continued through the floor pan to the chassis and mounted as in Ch. 7 App. 13 Diagram 41. f.
g.
h.
i.
j.
k.
l.
m.
The backstays in short wheelbase Vehicles may have to be mounted aft of the rear suspension mountings to the Chassis in order to comply with Ch. 7 App. 3 Art. 7.
Ch. 7 App. 13 Diagrams 55, 56 and 60 show the installation for an external front cage to an internally mounted rear roll bar and backstays showing the method for attachment through the Vehicle’ s roof skin. This installation may only be used where the body is rigidly mounted to the Chassis.
The backstays where mounted directly to the Chassis must be angled to the main roll hoop as shown in Ch. 7 App. 13 Diagrams 56 and 60 Vehicles configured with the backstays mounted in line with the main Chassis members built before 2014 are permitted.
The longitudinal bars connecting the front to rear roll bars should be straight or where a manufacturer’ s truck cab or hard top is fitted the bars may follow the contours of the roof.
A centre bar must be installed either diagonally or if evenly spaced in line with the exterior longitudinal bars as shown in Ch. 7 App. 13 Diagrams 56 If more than one centre bar is fitted the bars must be evenly spaced. Double crossed roof bars to the minimum specification for optional members are strongly recommended as shown in Ch. 7 App. 13 Diagram 19.
Where the roll-cage is mounted directly to the Chassis the front hoop may be mounted as shown in Ch. 7 App. 13 Diagram 57.
Alternatively the front hoop may be mounted directly to a fabricated chassis extension as shown in Ch. 7 App. 13 Diagram 58 The Chassis extension must be constructed as shown in Ch. 7 App. 13 Diagram 59.
External front hoops must be fitted with a horizontal bar approximately in line with the base of the windscreen of the same material and dimensions as specified for the main members of the ROPS and which may be bolted or welded to the front hoop. Recommended for Vehicles with an internal front
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 20 Appendix 10- Technical Regulations 759