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Old 07-06-2006, 01:55 AM
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how thick of tube to use for rollcage

1/4 inch tubing ? i want to do my rollcage but not sure what thickness of tubing to use

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Old 07-06-2006, 06:00 AM
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If you want to race your car you must design the rollcage per NHRA rules if you car is fast enough to require a roill cage. If your just asking for a general size, .125" wall thickness is a good starting point.

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Old 07-06-2006, 06:09 AM
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According to the 2006 NHRA Rule Book, for 8.50 second and slower cars, the main hoop, forward bars, and lower rails have to be 1-5/8" x 0.118" MS or 0.083" CM. The side diagonal may be single brace of 1-5/8" x 0.118" MS or 0.083" CM or you may use an "X" style brace using two bars of 1-1/2" 0.118" MS or 0.065" CM. The rear diagonals depend on whether you are using 2, 4, or 6 diagonals. Respectively, 1-1/2" x 0.058" CM, 1-3/8" x 0.049" CM, 1-1/4" x 0.049" CM, or MS all 0.118".The cross bar/seat back bar and the two lower diagonals from it to the frame/floor must be 1-1/4" x 0.118 MS or 0.065" CM (diagonals may be 0.058" CM). If you are going to do it yourself, I would get the rule book and read Section 16 thoroughly. It may be cheaper and easier in the long run to buy a kit from a respectable chassis fabricator.
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Old 07-10-2006, 08:14 PM

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Everything that redsdad has said in his post is correct, but I'll mention one other thing that you might want to consider before purchasing any steel. Some chassis component suppliers (Art Morrison in particular) has supplied (and recommended use of) one size heavier wall tubing than the 0.118" spec due to differences between the steel industry tolerances for wall thickness versus what is allowed by the NHRA sonic testing results. As I recall, that winds up being 0.134". Also, I believe you want to ask for HREW mechanical tubing. (DOM tubing in this size would cost you a small fortune.) Further, unless you have access to the correct size tubing bender die, you'll probably have trouble bending the main hoop succesfully, and would be money ahead to purchase a pre-bent kit from someone like Morrison or Chassisworks. Hope this helps, and good luck.
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