15.45. Members of the crew at the Start cannot be varied during an Event except with Official approval.
Appendix 3 – Technical Regulations- Classic Reliability Trial Vehicles
1. General Class Description 5. a. Front-engined production sports cars( except Vehicles in Classes 1, 6 and 90). b. Vehicles in full HST Historic Class specification with fiddle brakes disabled. c.
Non-production cars built mainly from pre-1941 components( except Vehicles approved for Class 2) individually approved. Such Vehicles may include some post war components including BMC A-Series engines up to 948cc, Reliant OHV engines, A Series Rear Axles, Ford 105E Series Back Axles, Tubular Frame Chassis. These Vehicles must have at least one operational European carburettor and run on tyres satisfying Art 7.1312( Crossplies).
Appendix 3 – Technical Regulations- Classic Reliability Trial Vehicles
3. Chassis / Body 3.2. In particular Vehicles must:
c.
For production cars any extensions must not exceed the overhang proportions of a non-production car. Any additional spare wheel carrier should be fitted as close as possible to the body and satisfy Arts. 7.9-7.127.8 – 7.11 Production cars need not comply with Ch. 7 App. 2 Art. 6 in respect of bonnets.
Appendix 3 – Technical Regulations- Classic Reliability Trial Vehicles
7. Wheels and Tyres 7.6. No tyre may be smaller than that recommended by the car manufacturer.
7.76. Standard tyres must be used and all types of Grip and Town & Country block patterns are prohibited. Radial tyres with a maximum tread gap exceeding 8mm are prohibited. A tyre will be deemed to have a block gap not exceeding 8mm if when fitted to a rim and inflated to 25psi an 8mm round bar will stick in the gap when horizontal. Purely circumferential gaps may be ignored.
7.87 In all Classes spare wheels must be firmly secured by a permanent fixing.
7.98. Not more than two spare wheels may be carried externally and these must be fitted as close as possible to the bodywork( excluding bumpers).
7.109. No part of the spare wheel( s) may be mounted externally in front of the windscreen unless in the manufacturers standard position or on the roof.
7.1110. Vehicles with an external rear-mounted spare wheel in the manufacturers standard position may add a second spare wheel mounted flush with the original wheel with no spacer.
7.1211. The spare wheel( s) or mounting( s) may not extend rearwards more that 200mm from a vertical line passing through the rearmost part of the original bodywork( excluding bumpers) or more than 100mm beyond
Motorsport UK National Competition Rules 2026 Edition 3
Chapter 22 Appendix 17- Trials( Chapter 17) 809