Classes
A - Experts, 2 or 4 stroke, up to 350cc Pre '70
B - E
xperts, Over 350cc /Twins / Pre Unti Pre '70
C - Clubman, Any cc - 2 o
r 4 stroke Pre '70
D - Intermediates - Any cc - 2 or 4 strike Pre ‘70<
br />E - Rigids, Any cc Pre '70
G - Gentlemen, In at Begins, exit at E
nd Card, anywhere in between. (Land permitting)
Machine eligibility –
For CLASSES A to G - All machines must utilize engine, gearbox, carburetor
, frame, hubs of British manufacture.
Note *FORKS are impossible to po
lice BUT it is important to maintain the silhouette for the period.
C
lass S - British Built Specials - BRITISH BUILT SPECIALS CLASS ELIGIBILITY<
br />Frames and Engines
Frames must be of original design and copies m
ust follow original design. No re-badged or modified non British bikes.
Alteration of steering angles and foot rest positions is allowed.
Mo
difications must be in keeping with those made in the era up to mid 1970’s.
Non British made engines only allowed in genuine British made bikes o
f pre 1970 design ( e.g., Dalesman with Puch engine). NO REPLICAS TO USE NO
N BRITISH ENGINES.
No mono-shock
Front Forks and Yokes
Any
forks 35mm diameter or less can be used provided the silhouette is in keepi
ng with the era. Modern REH forks allowed. No leading axle except for genui
ne British made (pre 1970) models such as Royal Enfield
Any alloy yok
es allowed including billet yokes.
Wheels and Brakes
Any hub/whee
l combination allowed provided silhouette is in keeping with the era and up
to 150mm dia.
Not Allowed – Disc brakes and non British twin leading
shoe brakes.
Carburettors
Any carburettor other than flat slide a
llowed.
Typical examples of eligible British Built trials bikes:
Cotton Cavalier, Dalesman, Dot, Greeves Pathfinder, Sprite Sachs Goldfinge
r and Wassell.