Class Information

Southern Downs Road Race Series 

Each year the Motorcycle Sportsmen hold Club Championship known as the Southern Downs Road Race Series.

This is a well contested series providing classes for all types of machines and riders.

Classes

Events on the Motorcycle Sportsmen of Queensland’s racing calendar include race classes to cater for most types of motorcycles and sidecars in the club’s racing calendar.

Typically, multiple classes are grouped into Formulas which make up the individual grids at club racing events.

Motorcycle Sportsmen of Queensland are a Motorcycling Australia (MA) affiliated club and all club events are conducted under MA permits.

As described below, many of the rules associated with the race classes provided by the club are as per the MA Manual of Motorcycle Sport (MoMS). There are some classes which are not included in the MoMS but are supported by the club. For these classes, links to (brief) rules have been included below.

Superbike
  • 750-1000CC 4CYL 4V 4T
  • 750-1200CC 3CYL 4V 4T
  • 850-1300 2CYL 4V 4T
    • as per Superbike class regulations & general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Sporties Superbike
  • 750-1100CC 4CYL 4V 4T
  • 900-1200CC 3CYL 4V 4T
  • 960-1300 2CYL 4V 4T
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Supersport
  • 450-600CC 4CYL 4V 4T
  • 500-675CC 3CYL 4V 4T
  • 600-750CC 2CYL 4V 4T
    • as per Supersport class regulations & general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Sporties Supersport
  • 450-640CC 4CYL 4V 4T
  • 650-895CC 3CYL 4V 4T
  • 650-960CC 2CYL 4V 4T
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Premodern Superbike
  • As per Superbike rules
  • machines Australian Design Rule (ADR) complied between sept 2000 – end of aug 2011 (models not updated but continued after cut off still eligible (ie. GSXR1000 09-16 no performance change.
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Premodern Supersport
  • 450-640CC 4CYL 4V 4T
  • 500-680CC 3CYL 4V 4T
  • 500-750CC 2 CYL 4V 4T
  • 750-1100CC 2CYL 2V 4T air cooled
  • machines ADR complied between sept 2000 – end of aug 2011 (models not updated but continued after cut off still eligible (ie. yzf-r6 08-16 no performance change)
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
PRE2k Superbike
  • 601-1300cc 4V 4T multicylinder
  • up to 500cc 2T multicylinder
  • machines ADR complied up until end of August 2000 (models not updated but continued after cut off still eligble)
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
PRE2k Supersport
  • 450-600CC 4CYL 4V 4T
  • 400-750CC 2 CYL 4V 4T
  • up to 350CC 2CYL 2T
  • 400-750CC 4CYL 4V 4T air cooled
  • 750-905CC 2CYL 2V 4T air cooled
  • machines ADR complied up until end of August 2000 (models not updated but continued after cut off still eligble)
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Sporties Production
  • up to 321cc 2CYL 4V 4T
  • up to 399cc 1CYL 4T
  • up to 251cc 4CYL 4V 4T
  • Nb – production class = All machines must have ADR compliance except supermoto machines.
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
500 Supersport
  • up to 401cc 4CYL 4V 4T (excluding 2023 onwards Kawasaki Ninja
  • 400RR/ZX4R/ZX4RR)
  • up to 500cc 1 CYL & 2CYL 2V & 4V 4T (inc Supermoto)
    • general technical specifications found in Motorcycling Australia General Competition Rules (Manual of Motorcycle Sport aka MoMS).
Formula STG (Supertwins Group)
  • 450-700cc 2CYL 4V 4T watercooled – aka *Supertwins
  • 252-450cc 4CYL 4V 4T watercooled
  • up to 905cc 1CYL 4V 4T watercooled (incl moto 3 type machines)
  • up to 300cc 2CYL 2T watercooled
  • up to 500cc 1CYL 2T watercooled
  • up to 905cc 2CYL 2V 4T aircooled
  • up to 1203cc 2CYL 2V pushrod air cooled (**roaring sporties superstock)

Supertwins:

  • All machines except Aprilia RS660 –
    • Engine modifications permitted provided commercially available for machine.
    • Suspension, Brake and Wheel modifications permitted provided commercially available for machine.
    • Forks, Wheels, and Brake assemblies may be substituted for other components provided they are of OEM commercially available origin.
    • Bodywork modifications open provided securely fitted with minimum 4 points of fixture per panel.
  • Aprilia RS660 specific rules –
    • Engine internals, Airbox, Throttle Bodies and Velocity Stacks must remain as per OEM.
    • Fork outer tubes must remain OEM – aftermarket fork internals permitted .
    • Aftermarket rear suspension units permitted.
    • Wheels & Brake Callipers to remain OEM – aftermarket Brake Master Cylinder, Brake Pads and Brake Lines permitted.

Roaring Sporties Superstock:

  • 1203cc limit -/- Modified Sportster -/- Buell 2V -/- XR1200 -/- XG750 Streetrods
  • Aftermarket pistons/cams permitted.
  • Exhaust Baffle compulsory.
  • Pump fuel only (NO E85) max #98 Unleaded.
  • 40MM CV Stock Carb (Jetting optional).
  • 46MM Injected throttle body.
  • Air Filter Element Compulsory.
  • Suspension modifications permitted including aftermarket items commercially available.
  • Wheels/Brake modifications permitted including aftermarket items commercially available.
  • ALL bikes must run TREADED Tyres (Wets permitted).
  • Aftermarket Handlebars/footrests permitted.
  • Aftermarket Rear Ducktail/Seat permitted.Front mudguards compulsory.

More info : https://www.facebook.com/roaringsportiesAustralia/

ALL OTHER ELIGIBLE MACHINES FOR STG – MODIFICATIONS OPEN.

Special considerations for F1 Pre2K and PreModern

The onus of proof of eligibility shall rest wholly upon the rider or entrant of the machine. Service and Parts manual publication dates are not proof of eligibility.

For the purpose of these rules ‘year of manufacture’ is defined as the year in which:

a) For a road-based machine, the machine or its latest major component was first generally available for sale and delivery to the purchaser,
b) For a race bike, the year in which the machine or the latest major component first appeared in open competition.

The dating of replicated major components is defined as the year of manufacture of the original component being replicated.

Major components are:

a) All engine and gearbox external castings,
b) Frames,
c) Swingarms,
d) Brakes,
e) Forks and fork yokes.

All other components shall be considered as minor components.
Major components that were manufactured outside a specific period, but which are visually indistinguishable when assembled from period components shall be eligible for that period.

Modifications to major components are allowed, providing such modifications are visually indistinguishable from modifications proven to have been used in the period.

Minor components may be modified or updated, provided that they remain visually compatible with the period being depicted.

Fairings, streamlinings and cosmetic components must be based on patterns known and used in the period.

Sidecars

Race preparing your bike

​Check out our visual guide for the person who wants to race-prep their bike.

Use this as a companion to the requirements set out in the Road Race chapter of the General Competition Rules available here.