the rearmost part of the original bumper position for the model of Vehicle whichever creates the lesser protrusion. An alternative maximum dimension not exceeding 400mm may be included in an accepted specification for a car in Class 7( c).
7.1312. Class 2 Vehicles must use cross-ply tyres( which need not be listed in Ch. 8 App. 4 Lists 1 or 2 but which must not be of Grip Town & Country or Dual Purpose pattern).
Appendix 4 – Technical Regulations- Car Trials Formula
3. Safety
3.1. Vehicles must comply with Construction and Use Regulations and be fitted with safety belts if appropriate. The following are recommended:
a. Safety roll-over bar to safety criteria Ch. 7 App. 3 Art. 22. b. The wearing of seat belts is optional when fitted to the Vehicle.
c. 3.2. At single site Events handheld fire extinguishers to a level of safety criteria specified in Ch. 7 App. 6 Art. 3. are recommended and which are accessible to the crew( note a 1.75ltr minimum for AFFF or 2x1ltr AFFF or 2x1kg Powder is permitted).
3.3. At Events which utilise the public highway handheld fire extinguishers to a level of safety specified in Ch. 7 App. 6 Art. 3. are mandatory and which are accessible to the crew( note a 1.75ltr minimum for AFFF or 2x1ltr AFFF or 2x1kg Powder is permitted).
Appendix 4 – Technical Regulations – Car Trials Formula
5. Engine 5.2. If forced induction is used, no the coefficient will apply be 1.4:1 unless specified in the Official Documents.
Motorsport UK National Competition Rules 2026 Edition 5
Chapter 22 Appendix 17- Trials( Chapter 17) 846