he information below is extended from the details of the vehicular class system described in the Technical Regulations.  It is a subset of the technical regulations and should be read referring to them, as needed.  As we are regulated by the MSA we recommend you also refer to the current Year Book (referred to as the Blue Book) for vehicles and safety equipment, as this will supercede our regulations if required.

Class 1

The Class for specials and ATVs (All Terrain Vehicles). Vehicles may be extensively modified, but must still conform with the Technical Regulations. Four wheel steering, slewing brakes and open centred (dumper) tyres are permitted in this class, subject to the ASRs for the event.

Class 2

The amount of modifications allowed in this class are restricted but do include: changing of chassis lengths, change of spring type, change of engine and/or gearbox type. The axle choice is free.

What is not permitted:

  • After market differential locking mechanisms 
  • Four wheel steering
  • Slewing brakes

Open centred tyres (subject to prevailing ASRs) are permitted. It is recommended an amount of bodywork be retained to give an impression of the make of the vehicle, this should be easily identifiable by the average spectator. All vehicles must conform to the current technical regulations.

Classes 3, 4 & 5

The standard RTV categories are for road-going vehicles.

The modifications are limited to: Engine conversions; power steering fitment; free choice of wheels and tyres.

The fitting of safety equipment of any type is permitted.

A front screen frame must be in place as should be a mid¬mounted roof frame when competing (this is the absolute minimum). Tyres such as those described in section 9i of the technical regulations. (open centred) are not permitted for use on RTV vehicles. A valid Road Fund Licence must be displayed for that vehicle. Auxiliary lamps and low hang¬ing bodywork (such as sills) may be removed. A FULL width front bumper must be in place.

Class 3

RTV Wheelbase less than 85″

Class 4

RTV Wheelbase over 85″ but under 100″

Class 5

RTV Wheelbase 100″ and over.

Class 6

Allows any vehicle which does not comply with the listed class specifications above such as a home built hybrid to compete in trials. It will be run over the same sections as the RTV trial. There are no wheelbase classes as found in RTV. The only restriction is that open class competitors should not be able to use fiddle brakes if fitted and will need to run on a road tyre as tyre rule 9i. applies to this category.

Frequently Asked Questions

Towing Points

All vehicles must be equipped with towing points front and rear. The tow ball or point must be bolted using suitable nuts and bolts of adequate size. These must accept a rope loop and be secure without requiring the use of shackles or other such attachments. On Modified vehicles where a tow-ball is used, it must be fitted so as to retain the rope, i.e. it should either be mounted with the ball facing away from the direction of pull, or, where it is mounted close to a chassis member, a trap should be formed to prevent the rope from coming accidentally detached.

Recovery Rope

Be equipped with a nylon rope of a minimum 25mm diameter. This rope must have a closed loop at each end and be of at least 4.5 metres in length. The use of chain or wire bond is prohibited. Polypropylene or hemp ropes are not advisable. N.B. Marshals may use any equipment approved by the Clerk of the Course