Enter your Interior Width, Interior Height, Tube Diameter, Wall Thickness, and Mounting Style into this Roll Cage Design Calculator to get your Main Hoop Width/Height, Min Bend Radius, Corner Bend Radius, and Tube Weight per Foot for a properly fitted cage.
Main Hoop Width
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Main Hoop Height
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Minimum Bend Radius
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Total Tube Length Needed
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Corner Bend Radius
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Estimated Weight
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For most racing applications, 1.75-inch diameter tube with 0.120-inch wall thickness is standard. Lighter vehicles may use 1.625-inch, while heavier vehicles or extreme racing may require 2-inch diameter tubes.
Minimum 3 inches of clearance is recommended between your helmet and any part of the roll cage. This accounts for suspension compression and impact scenarios while wearing racing gear.
A 3D bend radius (3 times the tube diameter) is standard for most roll cage applications. Tighter 2D bends are possible but require more specialized equipment and can weaken the tube.
Yes, this calculator provides universal dimensions that work with any tube bending equipment. The bend radius calculations help you determine if your bender can handle the required specifications.
Measure interior width from door panel to door panel at shoulder height, and height from floor to roof at the driver's seating position. Always measure with the driver seated in racing position.
Door bar mounting attaches the cage to the vehicle's door frame, while floor plate mounting uses plates welded to the floor pan. Floor plates provide better load distribution but require more fabrication work.
The weight estimate is based on steel tubing density and includes the main hoop structure. Actual weight will vary depending on additional bars, mounting hardware, and material variations.
Roll cages should meet relevant racing organization standards (NHRA, SCCA, FIA, etc.). Always consult your specific racing series' rulebook and have the cage inspected by qualified personnel before competition.