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Race-prepared motorcycles manufactured before December 31, 1949; no updating beyond such date.
Pre'65
Thoroughbred grand prix roadster motorcycles, and race-prepared roadster
motorcycles of comparable performance and appearance, manufactured before
December 31, 1964; no updating beyond such date. Examples of eligible
machines:
- Aermacchi long-stroke
- AJS 350 /500
- BSA 350 and 500 Gold Star, 500 twin
- Ducati narrow case, non-desmo singles
- Harley-Davidson sidevalve 750
- Honda 250 /305 Super Hawk
- Indian sidevalve 750
- Norton 350 and 500 Manx
- International, ES2, 500 twin
- Triumph 500 twin
- Velocette 350 and 500
- Yamaha 250 and 305 YDS
Pre '65 350cc up to 350cc two and four stroke
Pre '65 500cc 351cc through 500cc two and four stroke,
PROVIDED sidevalve engines up to 750cc are eligible
Displacements above do not include permissible overbores of 5% over class limit
iii. All machines subject to Grand Prix Period I rules, except as
specifically provided below.
iv. Chassis: MUST be original, no reproductions or replicas. Frames may be reinforced in a period manner. Swingarms must be both original AND unmodified. ONLY exception: Lister Replica frame used on Alan Taylor Special Velo.
v. Brakes: Drum only, of a design available in the period, with a maximum drum diameter of 8 ½ inches.
vi. Maximum fork tube diameter 35mm; forks may not have mounting lugs intended for disk caliper mounting.
vii. Rear shocks must not be mounted "upside down" or have air or other gas fittings.
viii. Bodywork must be of a type actually available in the period.
ix. Exhaust systems must be of a design and appearance actually used in the period; silencers excepted.
Table of Contents (click on any item to view that page)
Names and Addresses
Class Overview
Bumping
Rule Changes
Championship Points
General Rules
Early Vintage & Pre '65
Screaming 50's
Grand Prix (Period I)
Supervintage (Period II)
Middleweight (Period III)
Period IV
Formula RD
Formula CB350
Sidecars
American Twins