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Sidecar Technical
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T9-2 SIDECAR - TECHNICAL
DEFINITION
Sidecar:
T9-2-1
A vehicle with three wheels making two tracks on the ground in the direction of travel with a permanently attached sidecar forming a complete integral unit.
All sidecars must be inspected by a Director of SNZ or by an approved Official of SNZ who shall have
the authority to bar any machine or equipment he considers unfit for racing purposes. Such decision to
be final.
T9-2-2 BRAKES
Any brake on motorcycle sidecar is prohibited.
T9-2-3 CONSTRUCTION
(a)
The tubing used in the construction of the mainframe of a motorcycle sidecar shall have a minimum diameter of 25mm and minimum wall thickness of 1.5mm.
(b) The use of light alloys in the construction of the frame and front forks is forbidden.
(i) The front fork yokes or device to transfer load from the legs to the steering head are not to be a
fabrication of an aluminium alloy. Extruded one piece or machined from billet aluminium of good
design is acceptable. If U-bolts are used a minimum of 8mm diameter on 32mm fork legs.
(ii) All bushed shock mounts must be fitted with non-pull through washers or fit inside a double
bracket to ensure shocks cannot pull through their mount bolt.
(c) The height of any part of a Sidecar to be no higher than ONE (1) metre (at time of measurement, both
wheels are to be in a straight line).
(d) The use of titanium is forbidden (except engine parts).
T9-2-4 ENGINE
(a)
The cubic capacity of the machine is limited to 1,045cc, and only the rear wheel of the machine shall
be driven.
NOTE: Naturally aspirated (injected or carburetted) four Stroke engines to apply to above rule from
2017/18 season.
(b) Owners of vehicle must make individual arrangements with track steward or qualified SNZ Official to
inspect, certify and seal each individual motor before vehicle can be raced. NO SEAL, NO RACE.
(c) On liquid cooled engines an overflow pipe must be used which directs any overflow of coolant away
from the rider and passenger.
(d) Engines shall be covered by a fuel tank or guard to ensure the engine cannot be contacted by the
rider's body.
(e) Electronic Fuel Injection systems are permitted.
(f) Any engine inspected and found to contravene the rules will be declared an illegal engine. Refer Section M7-4 Specific Technical Offences.
(g) Fuel tanks must be constructed of a material that neither shatter or splinter upon impact.
Frames built after July 2009:
Fuel tanks must be mounted to the rear of the steering headstock
T9-2-5 WHEELS AND TYRES
(a)
(b)
(c)
The centre lines of the tracks made by the front and rear wheels of the motorcycle, when the machine is
proceeding directly forward, must be no further apart than 75mm, with the sidecar wheel no further
forward than half the distance of the wheel base.
Sidecar wheel must be cambered inwards. No outward camber is allowed. The inclination angle of the
Sidecar wheel must be between 25 degrees and 53 degrees.
Any wheels with slotted hubs must have bolts fitted between the spoke heads.
Sidecar Technical
(d)
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Wheels if constructed of the full disc type, aluminium or steel, to have a minimum disc wall thickness of
2.5mm for aluminium and 1.2mm for steel, and dished 50mm over diameter.
(e) The centre hub to be shouldered with the disc affixed to the rim also by a continuous bead or weld,
although a gap is allowable to make provision for the tyre valve.
(f) Front wheels of motorcycles to be fitted with knock-out spindle or an approved clamp to fasten on fork
tips.
(g) Front wheels must have a safety guard fitted on the left hand side when viewed from the riders seat.
Guard to be within the confines of the rims outer lip and fully cover the spoking.
(h) Any tyre with knobs or lugs protruding out past the side walls are not permitted on the front wheel.
(i) The one rear wheel and one rear tyre of a sidecar shall not exceed 200mm maximum tread width. Rear
wheel safety guard/disc covering spokes is not required when the wheel is fully enclosed by mudguard
no higher than 150mm from the ground as in T9-2-5 (l).
(j) All three wheels and tyres to be of motorcycle configuration and have a minimum rim diameter of
400mm.
(k) The drive shall be transmitted to the ground only through the rear wheel of the motorcycle.
(l)
Rear mudguard must be fitted, and extend from the rear seat to a maximum of 150mm from the
ground with the sidecar laden and must be fitted with either:(i) a one piece flexible mudflap without any slots which:
(i) is a minimum thickness of 6mm and be reinforced belting tyre type rubber.
(ii) ends no more than 20mm above ground level with the sidecar laden.
(iii) is attached to 3 sides of the mudguard and projects forward by a minimum of 75mm on each
side.
.(july2017)
(iv) Solo Bike stule deflectors are not to be used
(ii) an FIM approved sidecar dirt deflector.
(m) All sidecar machine rear fork legs to have an enclosed axle eye.
(n) The rear wheel must have a safety guard fitted on the right hand side when viewed from the riders seat.
Guard to be within the confines of the rims outer lip and fully cover the spoking.
(o) The sidecar wheel must be contained within a continuous 25mm horizontal crash bar, fixed rigidly to
the sidecar platform at sidecar floor height. Any open area in the sidecar platform inside the continuous
crash bar and on the running board on the nearside, must be filled with a suitable material to prevent
either the rider or passenger from trapping their feet. The inside of spoked, cast or welded wheels must
be covered with a disc or shield. Sidecar wheel spindle minimum diameter is 20 mm. One sided alloy ex
brake drum hubs are not to be used as sidecar wheels.
(p) The sidecar axle to have no stress raisers in the bend area.
(i)
The bend area is from the sidecar inner wheel bearing face to the first fixed mounting part of the
chassis plus 15mm each way (see diagram below).
(ii) A stress raiser is a thread, notch or groove and or a change in diameter. A change in diameter
must have a suitable smooth radius. Minimum radius is 6mm.
(iii) All axles to be crack tested (non-destructive testing) by the start of the season with certificate
supplied at CVI.
Sidecar Technical
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T9-2-6 EXHAUST PIPE
(a)
(b)
(c)
(d)
The exhaust pipe must be fixed to the cylinder head and frame with a minimum of three (3) clips (the
point of fixture at the cylinder head is considered one clip. The silencer must be fixed to the frame with
at least one clip.
Exhaust pipes and silencers may be of a “baffle” or “absorption” type and must fulfil the requirements
concerning sound control. An exhaust extraction (megaphone types) effect must not be caused by the
positioning of any tapered, conical or other shaped parts. Additionally a second flexible coupling must
be fitted from the first third of the silencer to the frame (Steel cable of at least 3mm dia. For reasons of
safety) or a solid steel spring.
Exhaust fumes must be discharged towards the rear but not in a manner as to raise dust, foul the tyres
or inconvenience the passenger, or any other riders.
Frames built after July 2009:
The entire exhaust system must be contained within the fairing, to ensure that the exhaust system cannot come in contact with any other rider, passenger, or motorcycle.
T9-2-7 HANDLE BARS
Handle bars must not be of greater width than 900mm and must be securely capped or plugged. When
light alloy handle bars are used, the distance between the two extremities of the clamping area (or of
the 2 clamps) must not be less than 120mm. The repair by welding of light alloy handlebars is prohibited.
T9-2-8 HAND HOLD
A suitable hand hold must be provided for the passenger on the offside of the rear wheel of the machine. Offside is left hand side when standing at rear of machine facing forward.
T9-2-9 THROTTLE CUT OUT
(a)
A device must be fitted to ensure that the ignition can be interrupted, must be mounted on the handlebars not more than 100mm from the throttle and securely attached to the throttle operation wrist
by a cord no longer than 300mm in the fully extended length, of a non-elastic material.
(b) The interrupter must operate in the primary (low tension) circuit of the ignition system.
(c) All throttle controls must freely return closed when not held by the hand. The use of a twin cable
push/pull throttle assembly to assure positive closing of the throttle valve(s) is mandatory from
2016/17 season.
(d) All throttle linkages, shafts and exposed cable liners must be shielded to prevent dirt or foreign material from directly contaminating them and restricting movement. The shield must be easily removable for
inspection of the mechanism.
T9-2-10 SKID PLATE
A skid plate may be fitted on the underneath side of motor which is to extend from the front of the
motor to the rear of the gearbox. The skidplate is to have a smooth finish and lead in and to be free of
sharp edges and nuts and bolts.
T9-2-11 DIMENSIONS
(a)
(b)
(c)
(d)
(e)
The overall length from leading edge of the front tyre to outside of rear mudguard must not exceed
2600mm.
The overall width must not exceed 1500mm.
The wheelbase measured from the centre of the front spindle to the centre of the rear spindle, must
measure between 1280mm and 1800mm.
The wheel track, measured between the centre lines of the track left by the rear and sidecar wheels,
shall be a minimum of 800mm and a maximum of 1100mm.
The width of the running board on the right of the motorcycle must not exceed 400mm.
Sidecar Technical
(f)
(g)
(h)
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The angle of inclination of the main body of the motorcycle must not exceed 10 degrees from the vertical.
For FIM competition only: The minimum ground clearance at any point of the sidecar shall be 75mm
unloaded.
Minimum Weight is 180kg.
T9-2-12 CHAIN GUARD
Chain guards must be fitted so that the primary chain and sprocket is enclosed. A guard for the chains
must be so constructed that a hand or foot cannot come into contact with the chain.
T9-2-13 FLOOR
The sidecar floor to be of sound construction and to fully cover area from front of crankcase to rear
axle 100mm tolerance.
T9-2-14 ATTACHMENT
(a)
If the sidecar attachment to the motorcycle is not an integral part of the chassis, it must be fixed in at
least 4 places in conjunction with Rule T9-2-14 (b, c, d).
(b) Two diagonal braces must be fitted of not less than 20mm x 1.5mm wall thickness to the unit from the
top half of the motorcycle frame and to the outer edge of the side car frame.
(c) One to be placed in the front position of the sidecar, one to be placed in the centre or to the rear of
the sidecar and the other two attachment points to bottom side of motorcycle frame.
(d) If rod ends are used, the minimum size shall be 12mm.
T9-2-15 FAIRINGS
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i)
(j)
The outside of the sidecar wheel and tyre must be covered by a non-rotating shield or fairing. This fairing must be securely fixed to the sidecar and outside of the crash bar.
Fairings or streaming or any cover must not be closer than 50mm to the front forks or tyre in any steering position and no further back than the exterior of the rear rim.
Fairings must be constructed of a flexible nature, either plastic, carbon-fibre or fibreglass and must remain flexible on the machine.
No metal or aluminium fairings are allowed.
No frame member or mounting point shall be outside the fairing, with the fairing attached to the motorcycle chair in no more than 8 (eight) places.
The fairing to have all corners and ends rounded, especially the front left corner of the chair.
Should a fairing be damaged or removed, no mounting point must be exposed.
The height of any part of a sidecar to be no higher than 1 metre.
The minimum clearance between streamlining, fairings or nose cones and the ends of the handlebars
or their attachments is 30mm with the front wheel in any position. No aerofoils or similar devices are
permitted.
No part of any nose cone or fairing may extend beyond a vertical line drawn through the leading edge
of the front tyre.
No part of the sidecar fairing may extend beyond a vertical line drawn at a tangent to the rear edge of
the back tyre.
No part of the Fairings, Streamlining or framework may come into contact with the ground when the
rear wheel only is raised 300mm from the ground.
Fairings considered too radical by the Head Scrutineer and Steward shall be referred to the Board.
T9-2-16 FUEL
Refer also to E5-1 and E5-2.
The use of fuel outside of specifications or blended fuel, will be declared an illegal fuel, Refer Section
M7-4 Specific Technical Offences.
Sidecar Technical
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T9-2-17 RACING NUMBERS
Please refer to Section T7
All sidecars to have front number plate between side wheel and steering head 200mm in diameter, e.g.
BMX type plastic number plate, with maximum 2 digit numbers, 150mm high and 30mm thick, legible
and of contrasting colours.
(b) Track Code Size: Letters to be at least 50mm high, with a stroke width of at least 7mm.
(c) Bibs or T-shirts may be worn, but must be tight fitting and of tidy appearance. Riders must have a visible number on their back.
(d) Sidecar Numbers 1, 2 and 3 to be reserved for NZ Championship placegetters, to be displayed if competitor so wishes until the next championship is run. No other competitor is to use these numbers.
(a)
T9-2-18 ARTICULATED SIDECARS
Articulated Sidecars are strictly forbidden. Four point mounted sidecars may be adjustable and locked
in position, but only when stationary.
T9-2-19 DANGEROUS CONSTRUCTION
The Steward of the meeting may exclude any vehicle, the construction of which he deems to be dangerous and shall give full effect to these Regulations by requiring the Scrutineer to check every vehicle
prior to its taking part in any competition. Unnecessary equipment (such as inter alia lamps, horns and
speedometer, exhaust pipes directed so as to raise dust, spikes or other attachments to the tyres) may
be deemed dangerous. The directions given by all Officials must be strictly obeyed.
T9-2-20 IMPOUNDING A SIDECAR
Refer Rules E2-2 to E2-7.
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