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Post Classic Supersport Eligibility (<400cc & <600cc fours, <750cc twins)
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.
Post Classic Superbike Eligibility (<750cc fours, <1000cc twins)
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.
The following criteria apply to both Post Classic Supersport and Post Classic Superbike:
FRAME: Only the original manufacturers standard frames are permitted. Subframes may be modified. Standard parts that bolt to the frame may be removed. E.g. Headlight subframes, 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 is shown above for each class.
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.
Eligibility Rules Class 9g:
Pages 36-39 of 2024 Eligibility Booklet
Number Board Details
Details to follow
Eligibility & Championship Co-ordinator:
Class Representative
Examples of machines eligible or already registered
Harley-Davidson RR250
Ringhini (350)
Harris TZ (250/350)
Rob North Yamaha TZ350
Maxton TZ (250/250)
