Rules and Regulations for Machines
CLASS 1: This class will be open to all air cooled monoshock and any air cooled monoshock trials motorcycle that has been converted to a twinshock.
ELIGIBILITY: The motorcycles should maintain the original silhouette from the date of manufacture.
ACCEPTABLE MODIFICATIONS ARE: The option to run tubeless tyres, to make minor modifications to the frame, and a choice of carburettors.
UNACCEPTABLE MODIFICATIONS: Disc brake conversions unless already fitted. Fork stanchions must not exceed 36mm.
CLASS 2: This class is open to all Spanish manufactured twinshock trials machines for any year. Standard Pre-78 twinshocks are eligible in this class. Suitable machines: Beamish Suzuki, Yamaha TY 175 (not Majesty) and Honda TL series. These machines must be completely standard as per original manufacture, otherwise enter class 3. The object of this class is to keep the cost of competing to a minimum but maintaining a highly competitive series.
ELIGIBILITY: The motorcycles should maintain the original silhouette from the date of manufacture.
ACCEPTABLE MODIFICATIONS ARE: The option to run tubeless tyres, to make minor modifications to the frame and a choice of carburettors; cycle parts can be changed as long as they are from the same period and from other Spanish motorcycles. Shock absorber and suspension movement should be similar to the original specification. Steering head angle can be moved and the swinging arm lengthened. The position of the footrest can also be moved.
UNACCEPTABLE MODIFICATIONS: Disc brake conversions. Fork stanchions must not exceed 35mm.
CLASS 3: This class is open to all twinshock trials motorcycles and highly modified Spanish twinshocks. Whilst the intention is to try to keep as close to the original machine silhouette as possible, more modifications will be allowed.
ACCEPTABLE MODIFICATIONS ARE: The option to run tubeless tyres, to make minor modifications to the frame, and a choice of carburettors; cycle parts can be changed as long as they are from the same period.
UNACCEPTABLE MODIFICATIONS: Modified monoshock trials bikes converted to twinshocks, air cooled monoshock engines and disc brake conversions. Fork stanchions must not exceed 36mm. NOTE: SWM jumbos fitted with the original 38mm forks are acceptable.
CLASS 4 BRITSHOCK PRE-72 MACHINES: This class is open to British motorcycles.
ACCEPTABLE MODIFICATIONS: The option to run tubeless tyres, to make minor modifications to the frame and a choice of carburettors. Cycle parts can be changed as long they are from the same period.