This is a summary of the groupings and classes of motorcycles racing in the CRMC Championships and machines eligible for CRMC races and parades.
AGE AND TYPE OF MACHINES
Machines considered in the following groups will normally be of a type raced in Europe in the relevant period. Other machines that do not meet this criterion may be referred for inclusion by the CRMC committee
Thoroughbred machines as raced in Grand Prix, TT and certain short circuit racing.
Machines built for racing and of a type raced during the period (as defined below) using as a basis engines not qualifying for Grand Prix together with certain machines which do not meet Sports or Production specification. Included in Post Classic is the Air-Cooled Class for machines up to 500cc
SPORTS (CLASSIC) & PRODUCTION (POST CLASSIC)
Essentially unmodified production road and sports machines.
SUPERBIKE (POST CLASSIC)
Machines 501cc and above built for racing and of a type raced during the period (as defined below) using as a basis engines not qualifying for Grand Prix together with certain machines which do not meet Production specification.
750 SUPERSTOCK (POST CLASSIC)
Post Classic 750 Superstock is designed for 750cc production based machines manufactured and raced pre 1987, such as the Yamaha FZ750 and Suzuki GSXR750.
Machines solely for Parade use which in the opinion of the management committee will add variety and interest to CRMC parades even though they might not specifically meet the eligibility requirements. Such machines will not normally be eligible for racing.
Machines will be sub-divided into age classifications (or periods) as detailed below:
CLASSIC 1 (previously Period 1)
All machines = 1st January 1945 and 31st December 1963
CLASSIC 2 (previously Period 2)
Four stroke machines
= from 1st January 1964 to 31st December 1972
Two stroke machines
= from 1st January 1964 to 31st December 1967
POST CLASSIC 1 (previously Period 3)
From 1st January 1973 for four stroke machines to the date stated below according to engine size
From 1st January 1968 for two stroke machines to the date stated below according to engine size
100cc up to 125cc single or twin cylinder = 31st December 1986
126cc up to 250cc single or twin cylinder = 31st December 1984
251cc and above single, twin, triple, or four cylinders
= 31st December 1981
POST CLASSIC 2 (previously Period 4)
126cc and above single or multi-cylinder machines
= from January 1st 1982 to December 31st 1986
Note: Any 50cc or 125cc Grand Prix machine,
whether two or four stroke, is eligible for Classic if constructed before 31st December 1972.