T12-2-30 Suspension (a) Any type of suspension may be used. (b) Suspension and aerofoil must not be able to be adjusted by driver while in the driver's seated position. (c) (i) OEM joints, fixed pivot and bush joints are permitted. (ii) Steel tractor links and rod ends are permitted. 12mm minimum eye size. (d) Rear suspension 5th coil type torque arm systems are not permitted. Un-sprung and sliding torque arm systems are permissible. T12-2-31 Shock Absorbers (a) OEM replacement shock absorbers must be used. (b) Internally adjustable and externally adjustable shock absorbers are not permitted. (c) Shock absorber must be removable for inspection. (d) Original brand names and part numbers must be visible, if no brand name or numbers are visible the shock absorber is illegal. (e) Steel rose joints/rodends, steel tie rod ends, tractor links and rubber bushing are permitted. T12-2-32 Springs (a) Coil springs are permitted however coil-over spring assembly kits must be either cast iron, steel or brass. (b) Any car fitted with coil springs must have the springs securely clamped, or chained in position. A coil-over assembly is regarded as a suitable restraint for the spring to be securely clamped. (c) No aftermarket torsion bar systems are permitted. T12-2-33 Steering Joints (a) Steel only OEM tie rod ends are permitted. (b) Tractor links and rod ends are permitted, 5/8 minimum eye size. T12-2-34 Brakes (a) Brakes must be fitted on both front wheels, and at least one brake on the diff assembly, so as to provide braking on all four wheels. (b) OEM brake parts must be fitted however mixing and matching is permitted. (c) No adjustable hydraulic or mechanical brake bias systems are permitted. (d) Only one brake master cylinder is permitted. (e) They must be maintained in perfect working order at all times. (f) The brakes must not be able to be adjusted by the driver while seated in the race vehicle, except for front to rear brake bias. T12-2-35 Wheels Refer Section T14 on wheels for specifications covering this class. (a) Bead lock rims are not permitted. (b) Bleed off tyre valves are not permitted. T12-2-36 Tyres (a) Standard road tyres must be used. All tyre grooves must not exceed 10mm in width or depth. (b) Racing type tyres, slick retreads are not permitted. (c) Hand grooving to original tread pattern of tyres is permitted, 10mm maximum groove width. Added grooves are not permitted. (d) Maximum width of tread not to exceed 210mm on the track, and overall width not exceed 255mm at or above bumper height. (e) All tyres must have sound casings.
2010 ELECTRONIC RULEBOOK