INDEX R
G / H
CR58	REAR-END
CR59	ROLL BAR / CAGE GENERAL REGULATIONS
CR60	"ROLL BAR" STRUCTURAL REQUIREMENTS - ALL ENCLOSED VEHICLES
CR61	"ROLL CAGE" STRUCTURAL REQUIREMENTS - ALL ENCLOSED VEHICLES
CR62	"ROLL CAGE" STRUCTURAL REQUIREMENTS - DRAGSTERS, FUNNY CARS, ETC.

ARTICLE:
CR58: REAR-END [WELDED SPIDER-GEARS IN REAR-ENDS ARE PROHIBITED IN ALL CLASSES]
Four wheel drive allowed in vehicles running 12.00 seconds or slower.
CR59: ROLL BAR / CAGE GENERAL REGULATIONS
The following regulations apply to all roll bars and roll cage specification requirements:
59.1	Steel tube shall be round in section and electrical resistance welded with full to penetration. Arc welding and in particular, TIG Heliarc welding preferred.
59.2	Welding must be free of slag and porosity whilst the process of flattening bars to necessitate joint welding is prohibited. All pipes must be notched to provide an acceptable joint where two bars meet.
59.3	No sleeving of roll bar/cage structure is permitted under any circumstances. All bending of pipes must be done with an approved process (e.g. Mandrel). Flush grinding of welds is prohibited.
59.4	All vehicles must have a 3mm sight hole drilled in relevant areas of the roll bar/cage structure to allow scrutineers to check wall thickness of tubing.
59.5	On enclosed vehicles (e.g. Sedans, Bakkies, Coupes, etc.) which are constructed in such a way that the body could separate from the chassis/roll cage in an accident, steel mesh or net of a maximum 75mm mesh is required to be fitted into the roll cage structure above the driver's head.
59.6	Threaded pipe or fittings, lap welded pipe, magnesium or aluminium pipe or tubing is not permitted.
59.7	On any vehicle where the standard flooring or any part of the standard structure has been removed, the roll cage must incorporate a rocker or sill bar to tie the front and rear of the cage together.
59.8	Any vehicle where standard flooring or any part of the standard structure has been removed or lightened (i.e. gutted), regardless of performance, must have a roll bar as a minimum requirement.
59.9	No material such as aluminium or copper will be allowed.
CR60: "ROLL BAR" STRUCTURAL REQUIREMENTS - ALL ENCLOSED VEHICLES
60.1	All enclosed vehicles (i.e. Sedans, Bakkies, Coupes, etc.) capable of running faster than 12.00 seconds and slower than 10.50 seconds are required to fit a minimum three-point roll bar structure. All open vehicles, i.e. convertibles, sports cars, roadsters and the like, must have roll bar protection regardless of performance.
60.2	All roll bars must be a minimum of 42mm x 3mm wall thickness, mild steel, and be within 150mm of the rear of the driver's helmet. The main hoop must extend at least 75mm in height above the driver's helmet whilst in the normal driving position, and be at least as wide as the driver's shoulders.
60.3	The roll bar must be adequately supported to prevent forward or lateral collapse in case of a spin out, collision or upset. Braces must be of the same diameter and wall thickness as the roll bar and intersect at a point not more than 100mm from the top of the main hoop.
60.4	Roll bar mounting points must be securely fastened to frame or frame rails either by approved welding methods or by using a minimum 150mm x 150mm x 3mm steel plate on top and bottom of the floor securely bolted together with at least four 10mm bolts and nuts to sandwich the floor.
60.5	If the car has no frame structure, the roll bar must be fitted using a minimum 150mm x 150mm x 3mm steel plate as a foot to which each bar is welded then another steel plate of the same dimensions must be bolted under the body with at least 109mm nuts and bolts to sandwich the floor as an adequate anchorage.
60.6	No pop rivets or fastening bolts will be allowed for any structural support/fitting of roll bars.
CR61: "ROLL CAGE " STRUCTURAL REQUIREMENTS - ALL ENCLOSED VEHICLES
61.1	All enclosed vehicles (i.e. Sedans, Bakkies, Coupes, etc.) capable of running quicker than 10.50 seconds are required to be fitted with a roll cage designed to protect from any angle (360°) and mounted at a minimum six points to the following minimum specifications:
61.2	Main roll cage hoops - 38mm x 3mm wall thickness, mild steel, or alternatively 1½" x 083" chrome moly.
61.3	Side/cross bars - 32mm x 2.6mm wall thickness, mild steel, or alternatively 1¼" x .065" chrome moly.
61.4	Roll cage mounting points must be securely fastened to frame or frame rails by approved welding methods, i.e. arc or preferably TIG Heliarc).
61.5	If the car has no frame structure the roll cage must be fitted using a minimum 150mm x 150mm x 3mm steel plate as a foot to which each bar is welded then another steel plate of the same dimensions must be bolted under the body using at least four 10mm nuts and bolts to sandwich the floor as an adequate anchorage.
CR62: "ROLL CAGE" STRUCTURAL REQUIREMENTS - DRAGSTERS, FUNNY CARS, ETC.
62.1	For all Dragster, Funny car and open-wheel, space frame type vehicles, specifically designed for Drag Racing, regardless of performance, the following minimum specifications will apply to the driver's compartment.
62.2	Roll Cage: Vehicles weighing under 370kg may use minimum 34mm x 3mm wall thickness, mild steel or 1(3/8)" x .083" chrome moly. All vehicles over 370kg must use a minimum 38mm x 3mm wall thickness mild steel or alternatively 1¼ x .065" chrome moly for cage tubing. Cage must be attached to shoulder hoop at six points for Funny Cars or open wheelers and five points for Dragsters. Front of driver's helmet must be a minimum of 75mm behind the front roll cage hoop.
62.3	Shoulder Hoop, Top and Bottom Frame Rails, Uprights and Cross-members: A minimum 32mm x 3mm wall thickness, mild steel or alternatively 1¼" x .065" chrome moly.
62.4	Diagonals: A minimum of 19mm x 3mm wall thickness mild steel or alternatively ¾ x .058" chrome moly.
MSA Technical Committee