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T12-2-15 Aerofoil (a) One only aerofoil, consisting of a centre section with no more than two single-piece side panels, is permitted. Note: polygon side panels are not permitted. (b) The aerofoil assembly must be fitted above the roof and the assembly must not exceed the width and length of the car roof. The aerofoil must be securely mounted to the rollcage. (c) The aerofoil assembly must not exceed the following measurements: 1200mm in length, 600mm in height, total maximum width 770mm. T12-2-16 Bumpers (a) Bumpers must be fitted front and rear. (b) The front crash bar shall not extend more than 50mm (2") beyond the outer edge of the front tyres, when in the straight ahead position. (c) The rear crash bar shall not extend more than 125mm (5") past the outer edge of the rear tyre. (d) Approved bumper heights front and rear minimum 330mm maximum 380mm. Bumper height measured at centre of bumper and ground level at any point across full width of vehicle. (e) Minimum depth of bumper 75mm. (f) Chassis to bumper braces must not extend further forward than 50mm back from the front edge of bumper. (g) Extensions to the side rail and rear of the front bumper must be square or rounded not less than 38mm (1.5"). (h) There must be upright and longitudinal radiator protection bars, minimum diameter 38mm, not further than 100mm from front edge top or bottom, and must be a minimum height of 250mm, suitably braced. (i) Front wheel protection bars are permitted, but must not extend higher than the point of attachment to the radiator protection bar, and must start 100mm in from the outside edge of the bumper, and must be vertical for a minimum of 100mm. (j) V-shaped or cow-catcher type crash bar protection is not permitted. No lifting bars will be permitted over the front wheels. (k) Under-rider bars will be fitted, extending to within 100mm from the outer edge of the bumper, and no further than 100mm from the front edge of the front bumper bar, mounted vertically. The minimum depth of the under-rider, to be 175mm, measured from the centre position of the front bumper. (l) The under-rider bar shall be constructed of pipe, minimum 42mm OD x 3mm wall, or 40mm x 40mm x 3mm RHS. A minimum of four vertical mounts shall be used. The end can be radiused to a maximum of 200mm. Two of these mounts to be braced or gusseted, a minimum of 150mm back to chassis rails. Box section or pipe brace construction same material as under-rider bar, gusset plating minimum 4mm. If the underrider structure is fully integrated into the front bumper, it must be constructed of a minimum of 3mm plate. (m) Dimensions as per figure T12-2-16(m). (n) Side rails to be level with bumper, extending 50mm past outer edge of front tyre, with wheels in straight-ahead position, and must be substantially braced to the chassis. (o) Rear wheel guards must be constructed of minimum 50mm x 38mm channel or box steel. They shall not protrude more than 125mm outside the outer edge of the rear tyre.

2010 ELECTRONIC RULEBOOK

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2010 NZ Speedway Rule Book  
2010 NZ Speedway Rule Book  

2010 NZ Speedway Rule Book

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