CHAPTER 20 CROSS COUNTRY Appendix 13- Technical Regulations for Junior Trials Vehicles
1. Chassis and Body
1.1. The Chassis and bodywork in Junior Trials Vehicles must be standard except where modified to comply with these Regulations and must be that from a proprietary machine.
1.2. Ch. 7 App. 7 Art. 1.4 does not apply in respect of the seat cushion being 15.25cm below the adjacent body. 1.3. App. 10 Art. 1.1 does not apply.
2. Engine
2.1. Vehicles must be fitted with a four-stroke petrol or diesel vertical crankshaft engine of the industrial and commercial restricted type and designed for use on a Ride on Mower or Lawn / Garden Tractor.
2.2. The engine must be fitted in its original location and retain its governor or restrictor which may not be modified or removed.
2.3. The engine must be fitted with an air filter the type and location of which is free.
2.4. The engine must be fitted with an effective silencer such that the Vehicle complies with the Noise limits provided by Ch. 7 App. 8.
2.5. The silencer and exhaust manifold are free as to type and location but must be fitted with shields when located outside of the bodywork or Chassis.
3. Transmission 3.1. A manual constant mesh transmission must be fitted of the type originally fitted to the Vehicle. 3.2. Transmissions of an alternative make or model may be fitted. 3.3. The Driver must be protected from all drive belts / chains. 3.4. Vehicles must not be fitted with a locked locking or torque-biasing differential.
4. Wheels and Tyres 4.1. Wheels and tyres are free.
5. Brakes
5.1. Vehicles must have brake systems operating on both rear wheels simultaneously by a single foot pedal which may activate the brakes either mechanically or hydraulically.
5.2. The brakes must be capable of locking the Wheels when applied at maximum speed.
5.3. A mechanical handbrake must be fitted which operates directly on both rear wheels and can hold the Vehicle on a 45 ° longitudinal gradient.
6. Steering 6.1. The steering system must retain its original location and operation and must be un-assisted. 6.2. Steering system components are free and may be strengthened. 6.3. A steering damper may be fitted.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 20 Appendix 13- Technical Regulations for Junior Trials Vehicles 774