• The construction of the chassis must be of good quality steel tube (either tube or box) with a maximum external diameter of 2 Inches. (50.8mm)
• The sidecar wheel must be offset to the left of the driver with the axle forward of the rear wheel.
• Hinged sidecars and steerable sidecar wheels are forbidden.
• Suspension is forbidden.
• Air or cooling ducts must not project outside the maximum allowable length or width of the outfit.
• A passenger must be carried and must always be protected from the road wheels and both primary and final drive train.

Engine Position

• The engine may be positioned anywhere between the front and rear wheel.
• The drive must be transmitted through the rear wheel only.

Dimensions

• Maximum overall length (including bodywork) 1570mm
• Maximum overall width (including bodywork) 1020mm
• Maximum overall height (including bodywork) 560mm
• Maximum wheelbase 1040mm
• Maximum track 690mm
• (The track is measured from the centre of the track left by the rear wheel to the centre of the track left by the sidecar wheel).
• A tolerance of + 5% to the above dimensions is permitted.

Brakes - Minimum requirements

• All sidecar outfits must have two independent systems. One system operating on the front wheel and the other on the rear wheel.
• At least one of these systems must be of the hydraulic type.
• A sidecar wheel brake is optional.

Wheels

• Must be of metal construction with a maximum rim diameter of 6 inches.

Tyres

• Open

Engine Cut-out Device

• An effective cut out device must be fitted which must be either bar mounted or mounted in a prominent position. A lanyard may be used.
• Any electrically operated fuel pumps must be wired in such a way as to cut out if the engine kill device is operated.

Fairings/ Bodywork and Passenger Hand Holds

• All sidecars are required to have a full front fairing.
• The sidecar wheel must be enclosed from the sidecar platform and level with the platform on the outside and right around the Periphery.
• A cut out to check the tyre pressure is permitted.
• The bodywork, fairing and sidecar wheel arch (and seat unit if applicable) must be constructed of GRP (fibreglass) or similar.
• All exposed edges must be rounded.
• All fairings and bodywork must be easily removable for scrutineering if required.
• All passenger handholds must be rigid and of the closed loop type.
• Ball ended handlebar control levers must be used.

Oil and coolant containment

• All drain plugs and filler caps, including coolant filler caps must be lock wired. Catch bottles/tanks must fitted to engine and gearbox breather pipes.
• All carburettor overflow and breather pipes must be attached to the carburettor and empty into a catch tank or bottle.

Coolant

• Water only no additives may be used.

Fuel

• Commercially available forecourt sale only.
• Race fuels are forbidden.

General Engine Specification

• Transmission is open.
• An effective silencer must be fitted.
• Cylinders may be over bored to a maximum of 2mm above the manufacturer’s standard bore.
• Carburettor size is open, unless otherwise specified.

Engine Specifications F1 (Yellow number on Black background)

• Single cylinder 4-stroke petrol motorcycle or scooter engine with a maximum capacity of 200cc.
• Tuning allowed to a maximum of 26 bhp.
  OR
• Single cylinder 2-stroke moto-cross engine to a maximum capacity of 85cc. Engine, gearbox, carburettor, ignition and exhaust to remain as manufacturer’s standard.
• Tuning not permitted - maximum of 26 bhp.

Engine Specifications F2 (White number on a Black background)

• Single cylinder 4-stroke petrol road based motorcycle or scooter engines to a maximum capacity of 125cc.
• Tuning allowed to a maximum of 26 bhp.
  OR
• Single cylinder 2-stroke petrol road based motorcycle or scooter engines to a maximum capacity of 80cc.
• Tuning allowed to a maximum of 26 bhp.

Other Regulations
Driver, passenger and machine must complete the race and cross the line together in order to score championship points in the sidecar classes.

2006 Season
It has been agreed that from January 2006 there shall be a single sidecar class consisting of single cylinder 125cc 4- stroke road based motorcycle and scooter engines.
This ruling will only come into force if government or local council authorities, or race circuit owners decide there is a ban imposed on the use of two stroke derived race outfits in their region.
Unlimited tuning will be allowed in this class as to allow the machines to approach the power level already set by the formula one race outfits.
In the instance of both 2-stroke and 4-stroke outfits are allowed to race together, (where there is no restriction imposed by the above mentioned governing bodies) there will be no separation on the points scoring system.

General notes
Any bodies contesting the ruling brought about by the regulations as above will not be heard at the race meetings, but will be addressed at a committee meeting at an appropriate time.

Additional notes
Scrutineering decisions are final. Any team forsaking the rights of the regulations set by the committee may lead to an exclusion from the event and possible ban.

Competitors notes
Any noted disruptive behaviour with regards to the safety of the race will be subject to a committee decision as regards to possible points deduction. Modification made to race m/c’s beyond the jurisdiction of the regulations during the course of the race event will lead to exclusion.
It has been decided that the 2005 season that both f2 and f1 outfits will race together. When signing on you will be asked which class you are competing in. The qualifying times and grid positions on race day will only apply to the class chosen.
How the combined class will be started on race day has not been decided as yet, i.e whether F1 outfits start first, closely followed by F2 or whether both classes start together.