12.7. Engines must comply with the silencing Noise levels and have induction air filter elements fitted that ensure the vehicle complies with noise regulations.
12.8. Only H shift pattern manual transmissions are permitted. The gear lever must remain the only means of changing gear unless an alternative method was originally fitted by the vehicle manufacturer as standard. Automatic transmissions are permitted provided that they are in their original configuration as fitted by the manufacturer to that specific Vehicle model.
12.9. The number and location of the driven wheels must remain as original to the model of Vehicle.
13. Wheels and Tyres 13.1. Wheels and tyre sizes are free but must fit within the standard unmodified wheel arch. 13.2. Vehicles must be fitted with tyres that are always legal for use on the Public Highway. 13.3. Tyres must comply with Ch. 8 App. 4 Arts. 2 – 3.
13.4. Vehicles must have all spare wheels securely fastened in position and must not be fitted with spiked or studded tyres or any non-skid attachments, other than chains if permitted by the Official Documents.
14. Electrical Systems
14.1. Vehicles must have a maximum of four forward facing beams as well as side and indicator lights, unless further restrictions are specified in the Official Documents.
14.2. Light pods are not permitted. 14.3. A headlamp must provide the main beam and dipped beam functions.
14.4. An auxiliary lamp provides a beam other than that provided by the headlamp. With the exception of Vehicles built before 31st December 1946 the maximum width of the lamp body of any auxiliary lamp must not exceed 222mm.
14.5. A headlamp may consist of a single reflector with a dual filament bulb, or separate reflectors each with single filament bulbs providing the functions of main beam and dipped beam separately. This will be considered as equivalent to a single dual filament headlamp unit. Lamp units comprising two reflectors where one is fitted with a dual filament bulb will be considered as a combined headlamp and auxiliary lamp. In this instance therefore no additional auxiliary lamps may be fitted.
14.6. Auxiliary lamps unless fitted as standard equipment using gas discharge or LED technology are not permitted and gas discharge or LED headlamp units may not be retro fitted.
14.7. Auxiliary lights must not be used in neutral sections except in poor visibility as permitted by law.
14.8. Where more than four beams are fitted as standard, only four may be used and the remainder must be rendered unusable for the duration of the event.
14.9. Vehicles must have all lights fitted and used according to motor vehicle lighting regulations. 14.10. External navigational or Marshal lights are not permitted.
14.11. For Events taking place wholly between half an hour before sunrise and half an hour after sunset Arts. 14.1, 14.8 and 14.10 do not apply.
15. Miscellaneous
15.1. Vehicles may not use racing style numbers, nor have any advertising except for event sponsor decals which must be incorporated within the rally plate.
15.2. They should be equipped with an effective method of stopping fuel supply, operable by the Driver when normally seated( the ignition switch would normally cover this requirement) and must use Permitted Fuel as defined in Ch. 1 App. 1.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 16 Part A( Autocross and Clubcross) Appendix 5- Technical Regulations
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