Classes A - Experts, 2 or 4 stroke, up to 350cc Pre '70 B - Experts, Over 350cc /Twins / Pre Unti Pre '70 C - Intermediates, Any cc - 2 or 4 stroke Pre '70 D - Clubman, Any cc - 2 or 4 stroke Pre '70 E - Rigids, Any cc Pre '70 G - Gentlemen, In at Begins, exit at End Card, anywhere in between. Machine eligibility – All machines must utilize engine, gearbox, carburetor, frame, hubs of British manufacture. Note *FORKS are impossible to police BUT it is important to maintain the silhouette for the period. Helmets - Must be worn at all BMCA events.