Post Classic Era 3
Posted on 5th March 2024 at 13:31
At present, the club caters for, with a couple of exceptions, machines from several Classic (Pre 1973) and Post Classic (Pre 1987) eras. As time moves on, there is inevitably a need to review the classes and extend the cut-off date to facilitate and encourage the continued use of certain racing bikes from the next era.
The Classic Racing Motorcycle Club are pleased to announce that, commencing from the start of the 2024 season they are extending the Post Classic Era cut- off date to accommodate 400 Supersport, 600 Supersport (to include 750 twins) and 750 Superbike (to include 1000cc twins) manufactured and used prior to 31st December 1994.
Post Classic Era 3
Post Classic Supersport Eligibility
Overview: Post Classic Supersport class is for production-based machines manufactured and available prior to 1st January 1995.
CYLINDER CAPACITIES FOR POST CLASSIC SUPERSPORT:
400 Supersport: Maximum Capacity is 400cc for 4 strokes & 250cc for 2 strokes. See permitted rebore facility in engine section below.
600 Supersport: Maximum Capacity is 600cc for 4 cylinder 4 strokes, 750cc for 2 cylinder 4 strokes & 500cc for 2 strokes.
WHEELS: Wheels may be 16, 17 or 18 inches in diameter. Wheels may be original fitment or period aftermarket products. Any type of wheel which was available and used in the period can be used. Wheel sizes may be 16”, 17” or 18”. In the interests of safety and availability, modern wheels that closely resemble wheels used in the period may be used.
TYRES: Shall be in accordance with both ACU Standing Guidelines for Road Racing Club events. Moulded treaded tyres only. No slicks or tyre warmers. Moulded ‘Wet’ racing tyres are permitted. The maximum tyre width is 180mm.
© Photo by Richard Llewellyn
Post Classic Superbike Eligibility
Overview: Post Classic Superbike class is for production- based machines manufactured and available prior to 1st January 1995.
CYLINDER CAPACITIES FOR POST CLASSIC SUPERBIKE:
750 Superbike: 4 stroke only. Maximum Capacity is 750cc for 4 cylinder & 1000cc for 2 cylinder.
WHEELS: Wheels may be 16, 17 or 18 inches in diameter. Wheels may be original fitment or period aftermarket products. Any type of wheel which was available and used in the period can be used. Wheel sizes may be 16”, 17” or 18”. In the interests of safety and availability, modern wheels that closely resemble wheels used in the period may be used.
TYRES: Shall be in accordance with both ACU Standing Guidelines for Road Racing Club events. Moulded treaded tyres only. No slicks or tyre warmers. Moulded ‘Wet’ racing tyres are permitted. The maximum tyre width is 190mm.
© Photo by Richard Llewellyn
The following criteria apply to both Post Classic Supersport and Post Classic Superbike:
FRAME: Only the original manufacturers standard frames are permitted. Sub-frames may be modified. Standard parts that bolt to the frame may be removed. E.g. Headlight sub-frames, centre stands, footrest brackets and lighting brackets.
FORKS: Forks must be as available & used in the period. Internals free from restriction.
SWINGING ARM: Must be the manufacturers original fitment to the main frame. Modifications to enable the fitment of wider tyres are not permitted.
ENGINE: Cylinders may be re-bored to a maximum of 1mm oversize. Crankshafts may be balanced. Cylinder head porting is permitted. The compression ratio may be adjusted. Camshafts & valve train may be modified. Starter motors and generators may be removed.
TRANSMISSION: No restriction.
CARBURETTORS & FUEL INJECTION SYSTEMS: Only standard original fitment carburettors & fuel injection systems are permitted, but these may be modified to achieve the appropriate air/fuel ratio.
AIRBOX: Free from restriction
IGNITION SYSTEM: Free from restriction, but see INSTRUMENTS and CONTROLS section below.
EXHAUST SYSTEM: Must meet the ACU sound limit requirements but is otherwise free from restriction.
INSTRUMENTS and CONTROLS: No out of period digital dashes, but digital temperature gauges may be used. After market rear sets can be used. Gear quick shifters, traction control systems, anti-wheelie & other out of period control systems are not permitted.
WHEELS: Wheels may be 16, 17 or 18 inches in diameter. Wheels may be original fitment or period aftermarket products. Any type of wheel which was available and used in the period can be used. Wheel sizes may be 16”, 17” or 18”. In the interests of safety and availability, modern wheels that closely resemble wheels used in the period may be used.
TYRES: Shall be in accordance with both ACU Standing Guidelines for Road Racing Club events. Moulded treaded tyres only. No slicks or tyre warmers. Moulded ‘Wet’ racing tyres are permitted. The maximum tyre width for each class is shown above.
BRAKE CALIPERS: Either manufacturers original fitment or period alternative brakes are permitted. Remote master cylinders are permitted, but radial calipers & master cylinders are not.
DISCS: Period type. The maximum permitted diameter of the disc is 320mm. No carbon discs.
BODYWORK and APPEARANCE: Should be in keeping with the period & reflect the period look.
ROAD EQUIPMENT: All ancillary road equipment must be removed. i.e. all lighting units, horn, mirrors, stands, pillion equipment, etc.
MANDATORY RACE FITTINGS:
As per ACU Road Race Standing Regulations.
Note:
The motorcycle must be fitted with a front brake lever guard.
A guard (Shark Fin) protecting the interface between the bottom chain run & rear sprocket must be fitted.
A rear red rain light must be fitted & working.
The lower fairing or reservoir below the crankcases must be capable of containing 50% or more of the total oil & coolant capacity of the engine.
Tagged as: Post Classic Era 3
Share this post: