CHAPTER 20 CROSS COUNTRY Appendix 10- Technical Regulations( not Junior Trials)
General
1. Chassis 1.1. The Vehicle must have a minimum wheelbase of 127cm( 50in).
2. Body( including Aerodynamics)
2.1. Unless rear-engined Vehicles must have a bonnet or metal casing of solid flame retardant material covering or surrounding the engine which is secured by fasteners of adequate strength and with a positive locking action.
2.2. Windscreens must be erected unless the Event takes place wholly on private property or the Official Documents state otherwise.
2.3. Tailgates may be removed.
2.4. Be equipped with mudguards for all Wheels which present no sharp edges and cover the complete Wheel( flange + rim + tyre) around an arc of 120 degrees. This minimum coverage must:
a. be achieved with a continuous surface of rigid material within which ventilation louvres may be fitted. The tyre must not be visible when viewed from above b. extend forward ahead of the axle line
3. Seating
c. extend downward behind the Wheel.
3.1. Vehicles must be equipped with two fixed seats for the Driver and Passenger unless the Official Documents state otherwise.
3.2. The rearmost part of these seats must not be behind the rear wheel axis.
3.3. In the case of non-production Vehicles the rearmost part of any additional seat must not be more than 38cm behind the rear wheel axis.
4. Engine
4.1. If forced induction is used the coefficient will be 1.7:1 unless the Official Documents or specific Technical Regulations state otherwise.
4.2. Must have positive throttle closure by external springs so that the throttle automatically closes in the event of any failure of the linkage.
4.3. Art. 4.2 above does not apply to Vehicles fitted as standard with original manufacturer fitted electronic throttle control for that Vehicle.
5. Suspension
5.1. Vehicles must be fitted with sprung suspension between Wheels and Chassis unless originally manufactured otherwise.
5.2. Where the top mounting of the shock absorber whether or not it is fitted with a coilspring is mounted directly to a main member of the roll-cage a brace must be fitted between the mounting point and the chassis or those members of the Vehicle frame acting as the Chassis.
5.3. It is prohibited to mount the shock absorber by drilling and / or welding a stud or bolt directly to the roll cage.
5.4. All mountings must be made with reinforcements in material at least the same thickness as the roll cage wall thickness.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 20 Appendix 10- Technical Regulations 757