b. c.
Lightweight engine bonnet covers, boot lids and doors All non-stress-bearing internal components may be removed
17.6. Cars more extensively lightened than indicated above must be fitted with full roll-over bars to requirements of Ch. 7 App. 3 Arts. 22 – 23.
18. Engine 18.1. See Ch. 7 App. 2 Arts. 8.2 – 8.4.
19. Brakes 19.1. Brakes must comply with Statutory Requirements as to the Construction of Motor Vehicles.
19.2. If there is no mechanical system available for braking on at least two wheels, two hydraulic systems are required so that in event of failure of one braking can be maintained on at least two wheels.
19.3. Vehicles constructed after 1930 must have brakes on all wheels.
19.4. When tested immediately prior to an Event the braking system on all Vehicles must work without impairing the Driver’ s control.
19.5. It must be possible under all conditions, running or stationary, for 25 % minimum braking effort to be applied by the Driver through the braking system to each axle.
19.6. Brake balance adjusters must not be available for adjustment during running if they contravene Art. 19.5 above.
20. Wheels
20.1. Any spare wheel must be securely fastened in position( a spare need not be carried unless specified in the Official Documents).
21. Tyres
21.1. Only tyres for use on the Public Highway by Vehicles or light commercial Vehicles are permitted. Slicks or any tyres that have been wholly or partly hand-cut are not allowed unless the Official Documents state otherwise.
22. Transmission
22.1. If fitted with front wheel drive, Vehicles must have an effective differential action between the driving wheels. Reverse gear is optional in Autocross Specials( Class D).
23. Oil Systems 23.1. In rear-engined Vehicle no part of the oil tank may be located to the rear of the gearbox casing.
24. Electrical Systems
24.1. It is permitted to remove all lamps. Vehicles in Classes C & D and all other Vehicles where the standard rear lights are removed or not functional must be equipped with two rear red warning lights with a minimum of 21W( or LED equivalent) each and an illuminated area of 60 sq cm. These must work with or replace the Vehicle brake light system at all times, must be between 600mm and 1500mm above the ground and must be clearly visible from behind. The fitting of generators is optional.
25. Silencing 25.1. Vehicles must comply with silencing levels in Ch. 7 App. 8 Art. 2.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 16 Part A( Autocross and Clubcross) Appendix 5- Technical Regulations
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