Chris Tobin
New member
- Joined
- Jun 20, 2008
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SCORE and BITD both use similar rules regarding cages and such but the BITD puts their rulebook on line so that is the easiest to access.
Here is a link to it: http://www.bitd.com/images/stories/pdfs/2015_CTRuleBook.pdf
And here is the excerpt from the Rollcage section:
VEHICLE SAFETY EQUIPMENT
SCR34: ROLLCAGES
Best In The Desert Racing Association believes that it is each competitor’s responsibility to
present a safe vehicle for pre-race tech inspection. You must maintain your safety equipment
including the roll cage integrity. No changes to the recommended minimum construction
specification with respect to diameter or wall thickness are anticipated at this time. As in the past,
Best In The Desert Racing Association reserves the right to not allow any safety cage design that,
in the view of the tech inspector, is not fit for competition. You, as the competitor, are ultimately
responsible for your own vehicle’s safety features with respect to the design, quality of execution,
maintenance and repair of the roll cage structure.
All vehicles in competition are recommended to be equipped with a rollcage based on seamless
mild steel/4130 chrome molly steel tubing. Minimum design and tubing size for rollcage structure
is in accordance with Table 2.
Table 2. Minimum Tubing Dimension
Vehicle Weight
Under 2000 lbs. 1.5" x 0.95"
2001 to 2500 lbs. 1.5" x .120"
2501 to 3000 lbs. 1.75" x .095"
3001 to 4000 lbs 1.75" x .120"
4001 pounds and over 2.0” x .120”
Note: See manufacturer’s’ reference charts for alloy steel
tubing equivalent strengths. No aluminum or other
non-ferrous materials are permitted.
Definitions and General Information
28
MATERIAL
Rollcage construction material may be crew, dom, whr, wcr mild carbon steel or 4130 chromoly.
4130 chromoly is highly recommended for all rollcage construction. Stress relieve all welded
intersections by flame annealing. All welds must be of high quality and craftsmanship with good
penetration and with no undercutting of parent material. Oxy-acetylene brazing on rollcage is
strictly forbidden.
ROLLCAGE DESIGN
All rollcages must be designed and constructed with one front vertical hoop, one rear vertical
hoop, two interconnecting top bars, two rear down braces, one diagonal brace and all necessary
gussets. The two top interconnecting bars must be placed as far to the outside of the top part of
the front and rear hoops as possible. Rear down braces and diagonal brace must angle a minimum
of 30 degrees from vertical. At the bottom of the diagonal brace there must be a cross member of
the same tubing material and dimensions as the hoop. All rollcage components (hoops, braces,
gussets, etc.) must have a minimum of 3-inch clearance from the component to the vehicle
occupant’s helmets when occupants are seated in their normal riding positions. All portions of the
roll bar or bracing that might come into contact with the vehicle occupant’s helmets must be
padded. All portions of the roll bar or bracing that might come into contact with the vehicle
occupant’s helmets must be padded.
Rollcages must be securely mounted to the frame or body. All intersecting points must be
gusseted and braced. Cab or body mounted rollcages must be bolted through the body structure
and be attached by use of a minimum two 0.1875-inch thick doubler plates (one on each side of
body structure). Bolts and nuts must be at least 0.375-inch-diameter s.a.e. Grade 8 or equivalent
aircraft quality. Welding of cab or body mounted rollcages to body structure is strictly prohibited.
Rollcage terminal ends must be attached to a frame or body member that will support maximum
impact and not shear or allow more than 1.5 inches of movement in the cage terminal end.
All vehicles including those with stock steel doors must have at least one side bar on each side of
vehicle that will protect occupants from side impact. The side bars must be of the same tubing
material and dimensions as the rest of the rollcage. The side bars must be as close to parallel to
the ground as possible, be located to provide maximum protection to the occupants, and be
securely welded to the front and rear hoops. The location of the sidebars must not cause difficulty
in entering or exiting the vehicle.
Gussets constructed of 0.125-inch x 3-inch x 3-inch flat-plate or split, formed and welded cornertubing,
or tubing-gussets made of the same material and thickness as the rollcage may be used.
Gussets must be installed at all major intersections, including diagonal and rear down braces,
where single weld fractures can affect occupants’ safety.
In the stock classes (8100) on vehicles with rear leaf spring suspension you may add a plate to the
front leaf spring outboard mounted hanger if a main roll cage mount is terminated at that point.
The plate may only be place in the “V” of the hanger and be welded in place to the hanger only.
The plate itself may not attach directly to the frame of the vehicle except for the roll cage
attachment bolt that passes through the plate, the roll cage terminal end and the frame. The plate
may only be large enough to allow for a good brace for the roll cage mount. Plate design and
installation must meet with Best In The Desert Racing Association approval. The rear leaf spring
hanger of the rear leaf spring may have a kicker bar attached to the flat horizontal portion of the
hanger and extend to the main rollcage down brace. The main rollcage cannot directly mount to
the rear hanger. The design of kicker bar must be such that you can unbolt it from the hanger.
Kicker design must meet with Best In The Desert Racing Association approval.
In the stock classes (8100) you may attach a main roll cage mount to the top of the front spring
bucket. Design and installation must meet with Best In The Desert Racing Association approval.
