CHAPTER 8- PERMITTED FUELS AND TYRES AND TESTING
The following Appendices to this Chapter apply:
1. General
App. 1 Permitted Fuels App. 2 Fuel( and other Vehicle fluids) Testing App. 3 Tyre Testing and Checking App. 4 Permitted Tyre List
1.1. This Chapter must be read in conjunction with specific sporting discipline Chapters and where applicable Chapter 2( Judicial) and Chapter 1 App. 1( Nomenclature and Definitions).
1.2. This Chapter applies to all sporting disciplines Events and Championships unless specific waiver or variation in respect of the use of permitted fuels or tyres has been approved in writing by the ASN.
1.3. In the interests of any of sustainability, Statutory compliance, or sporting fairness the ASN reserves the right to amend the Regulations in respect of fuel and / or tyres at any time. Wherever possible reasonable notice of any change will be given by publication on the ASN website.
1.4. Only Permitted fuels may be used in Competitions. 1.5. Only Permitted tyres may be used in Competitions.
1.6. It is always the Competitor’ s responsibility while competing to ensure conformity with the relevant Regulations.
1.7. Subject to Art. 1.8 below it is an offence in breach of the NCR to use fuel or to use tyres that are not permitted and which breach may be subject to Judicial procedures under Chapter 2.
1.8. If it is discovered at pre-Competition scrutineering that a Competitor has the incorrect tyres this will be reported by the Scrutineers to the Clerk of the Course and who has the authority to permit the Competitor to achieve conformity and re-present the Vehicle to the scrutineers for approval but the commencement of the relevant Competition shall not be delayed to facilitate such re-presentation.
1.9. All fuel and all tyres may be checked for conformity with the NCR in accordance with the prescriptions at App. 3 and 4 respectively of this Chapter. It is an offence in breach of the NCR to refuse to cooperate with any official test procedure required by the Organisers and or the ASN. Such a breach may result in Disqualification from relevant Events and suspension of Competition Licence and referral to the National Court.
2. Specific matters relating to tyres
2.1. Tyres must comply with Regulations for the duration of an Event including any Regulations regarding tyre pressure.
2.2. Except FF1600 per Art. 2.3 below, treaded tyres must have a minimum of 1.6mm tread throughout the circumference of all tyres at the commencement of the relevant Competition.
2.3. FF1600 tyres must have a minimum of 1.0mm tread throughout the entire circumference of all tyres at the commencement of the relevant Competition.
2.4. Where tyre choice is free it is the responsibility of the Competitor to ensure that the tyres used are of adequate speed rating and construction for the Competition.
2.5. The fitment and / or use of pressure control valves is prohibited in Competition. 2.6. The use of chemical tyres softeners is prohibited unless specifically allowed in Official Documents.
2.7. Except for the use of inner tubes( where permitted by the tyre manufacturer), the interior of the tyres being the space between the wheel rim and internal tyre carcass must only be filled with air or nitrogen.
Motorsport UK 2025 National Competition Rules Version 11
Chapter 8- Permitted Fuels and Tyres Testing 317