This page outlines the class structure for the series and rules for machine eligibility. In order to compete in the series machines must comply with this criteria. If a machine that does not comply is ridden in a round of the series, championship points will not be awarded and to compete in future rounds you will need to ride a machine that complies.

It's a classic series. The series was created primarily for classic twinshock and air cooled monoshock bikes, not highly modernised hybrids. Modifications are allowed in keeping with those made in their respective eras with a small leeway for fitment of a few modern items, but heavily modernising bikes to extremes is not allowed as this contradicts not only the principles of the series but also the reasons of wanting to own and ride a classic twinshock / air cooled mono. The organisers don’t want the twinshock equivalent of what has happened with Pre65 machines, it's not what this series is about.

Sections are traditonal format, not stop/hop, the rules are no-stop riding and the bikes in standard spec are capable of competing on them.  This is the format, you know what you are signing up to when you enter an event so don't complain if your bike is found to not meet the criteria

CLASS  1  -  Air Cooled Monoshock

This class is open to all air cooled monoshock bikes that were in production before 1990. A couple of exceptions are the Beta Supertrial and Fantic Coach/Clubman which were produced after 1990 but were continuations of the last air cooled bikes as budget alternatives to the then current water cooled range.

Machines should maintain the original silhouette as of the date of manufacture.

 

Permissable alterations :–

 

Frames must be of original design

Billet yoke conversion

Footrest position can be altered

Steering angle can be altered

Swingarm length altered

Tubeless rims may be fitted

Disc brakes may be fitted front and rear - discs were production items in this era on virtually all machines and aftermarket disc conversions were also available

Any carburettor may be fitted

The following alterations are not allowed :-

Fork stanchions must not exceed 36 mm*

No hydraulic clutches

No water cooled era engines fitted with air cooled cylinders and heads

* Late model Fantic Coach and Clubman were produced with 40mm forks, therefore these are acceptable on these bikes. They cannot be retro fitted to earlier models.

CLASS  2  -  Twinshock  

This class is open to twinshock machines manufactured up to 1986.

 

Machines should maintain the original silhouette as of the date of manufacture. 

Permissable alterations :-

Frames must be of original design. Copies must follow original design

Billet yoke conversion

Footrest position can be altered

Steering angle can be altered

Swingarm length altered

Tubeless rims may be fitted

Any carburettor can be fitted

Electronic ignition

Cycle parts can be inter-changed as long as they are Pre 1986 (ie: Ossa forks in a Bultaco etc)

 

The following alterations are not allowed :-

Modified monoshock bikes converted to twinshocks

Air cooled monoshock engines

Disc brake conversions

Hydraulic clutches

Fork stanchions must not exceed 36 mm**

** Original SWM Jumbo 38mm Betor forks are acceptable

Anyone entering on a monoshock converted to twinshock will be placed into Class 1

CLASS  3  -  Pre-75 British Bikes

This class is open to Pre-75 British  bikes 

 

There is little point in creating a specific rule set for this class as hundreds of bikes have already been built to existing criteria set by most classic clubs countrywide. Eligibility for this class follows existing criteria although some have been relaxed slightly

Permissable alterations :-

Replica frames or modified originals 

Billet yokes

Billet forks

Billet hubs

Forks, yokes, wheels from twinshock bikes

Forks with modern internals, modern REH forks

Tubeless rims

Any carburettor

Electronic ignition

The following alterations are not allowed :-

Disc brakes

Hydraulic clutches

Fork stanchions must not exceed 35mm