CHAPTER 17 TRIALS Appendix 4- Technical Regulations – Car Trials Formula
Note:( 1) * indicates that additional information must be provided in the Official Documents Note:( 2) This Appendix must be read in conjunction with App. 2 and Ch. 7 1. Classes: 1.1. * Classes are free but must be stated in the Official Documents. The following are suggested. 1.2. CLASS A FWD SERIES PRODUCTION CARS CARRYING NO BALLAST Front wheel drive cars of any age, carrying no ballast and having no modifications except as follows:
a. the fitting of under body protection weighing no more than 10kg( including fittings) b. c. the replacement of wheels in accordance with Art. 8.2 below the replacement of tyres in accordance with Art. 8.3 below Minimum tyre pressures on driven wheels: up to 1200 cc: 12 psi up to 1400 cc: 14 psi over 1400 cc: 16 psi
1.3. CLASS S NEW UNMODIFIED FWD SERIES PRODUCTION CARS CARRYING NO BALLAST
Standard front wheel drive cars first registered on or after 1 January 2009 *, taxed for road use, carrying no ballast and having no modifications except as follows:
a. the fitting of under-body protection weighing no more than 10kg( including fittings); b. c. the replacement of wheels in accordance with Art. 8.2 below the replacement of tyres in accordance with Art. 8.3 below Minimum tyre pressures on driven wheels: up to 1200 cc: 12 psi up to 1400 cc: 14 psi over 1400 cc: 16 psi * 2009 will be retained for the years 2024, 2025 & 2026 after which it will be reviewed.
1.4. CLASS B FWD SERIES PRODUCTION CARS
Permitted modifications in accordance with Arts. 2.1 – 10.5 below. Minimum tyre pressures on driven wheels:
up to 1200cc: 12 psi up to 1400cc: 14 psi over 1400cc: 16 psi
1.5. CLASS C 1990 ONWARDS RWD SERIES PRODUCTION CARS AND SPORTS CARS
Rear wheel drive Series Production Cars and Sports Cars first registered on or after 1 January 1990. Permitted modifications in accordance with Arts. 2.1 – 10.5 below. Minimum tyre pressures on driven wheels:
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 17 Appendix 4- Technical Regulations- Car Trials Formula 622