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Cage Tubing Diameter
The rules below dictate the tube diameter for various car weights. How do these rules apply - for actual car weight, or classed car weight?
My ITS car might be classed at 2600 lbs but with me in it with fuel it weighs 2750 lbs.
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The following table shows the minimum allowed tubing outer
diameter and wall thickness by vehicle weight:
GCR Vehicle Weight Tubing Size (inches)
(outer diameter x wall thickness)
Up to 1700 lbs 1.375 x .080
1701 - 2699 lbs 1.500 x .095
1.625 x .080
2700 lbs and up 1.750 x .095
1.625 x .120
If the tubing diameter used is at least .250 inch above the
minimum diameter required, based on vehicle weight, the
minimum wall thickness may be .080 inch.
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