When building or upgrading a race car, choosing the right tubing is essential for safety, rigidity, and ease of fabrication. This guide helps buyers select 5 reliable options for roll cages and chassis work, each geared toward different fabrication needs. Best for shops or hobbyists focusing on standard DOM and chromoly builds, these tubes balance strength, workability, and availability. The top picks cover common diameters, wall thicknesses, and pre-notched options to streamline assembly. Whether you’re aiming for a bolt-in barrier or a full custom cage, these selections clarify who each product suits best.
Summary of selected products
| Product | Material | Diameter / Wall | Length | |
|---|---|---|---|---|
| Round DOM Roll Cage Tubing, 1-3/4 x .095 Inch | 1020 DOM steel | 1.75″ / .095″ | 7 ft (also 3, 10 ft options) | Strong, smooth finish; ideal for cages & chassis fabrication |
| Allstar Performance ALL57264 Steel Tube, 3/4″ x 1″ O.D., 10″ | Steel tube | 0.75″ / 1.0″ | 10″ | Compact, versatile small-diameter option |
| Mild Steel Roll Cage Tubing, 1-3/4 OD, .109 Wall, 7 Ft. | HREW 1020 mild steel | 1.75″ / .109″ | 7 ft | Pre-notched for easier assembly; durable |
| Round Chromoly Chassis Tube, 1-5/8 x 0.083 Inch | 4130 Chromoly | 1.625″ / .083″ | 7 ft | High-strength fabrication for cages |
| Allstar Round DOM Steel Tubing 1-5/8in x .120in x 7.5ft | DOM steel | 1.625″ / .120″ | 7.5 ft | Solid, long length for larger cages |
Round DOM Roll Cage Tubing, 1-3/4 x .095
Key features: 1020 DOM steel provides reliable strength with uniform wall thickness. The tube’s 1.75″ outside diameter and .095″ wall thickness align with common motorsports fabrication standards. Available in 3, 7, or 10 ft lengths to fit a range of build plans.
Best for: Fabricators seeking a proven DOM option with a smooth finish for bending and welding. Ideal for cages and chassis components requiring consistent wall thickness.
Caution: Check local rules for specific roll cage specifications, as standards vary by series and sanctioning body.
Allstar Performance ALL57264 Steel Tube
Key features: Steel tube with small-diameter options, useful for frame gussets and light-bar constructions. The compact 10″ length can simplify short sections in tight cages or chassis layouts.
Best for: Projects needing small-diameter tube sections or incremental cage pieces where space is at a premium.
Caution: Short length may require splicing for longer runs; consider additional pieces for full cages.
Mild Steel Roll Cage Tubing, 1-3/4 OD, .109 Wall
Key features: 1-3/4″ OD with .109″ wall thickness, designed for harsh racing environments. Pre-notched for easier assembly, and made from HREW 1020 mild steel for longevity.
Best for: Builders seeking a balance between strength and ease of fabrication, with time-saving pre-notches.
Caution: Mild steel can be heavier than chromoly; plan weight and handling implications accordingly.
Round Chromoly Chassis Tube, 1-5/8 x 0.083
Key features: 4130 chromoly provides high strength at reduced weight, ideal for roll cages and chassis work. Pre-cut 7 ft length simplifies layout and measurement.
Best for: Serious racers needing high-strength material with good formability for complex cage designs.
Caution: Chromoly requires proper welding procedure to avoid fatigue or heat-affected zones; verify welding specs for your build.
Allstar Round DOM Steel Tubing 1-5/8in x .120in
Key features: DOM steel with a thicker .120″ wall supports stronger sections and longer spans. 1-5/8″ diameter is common for mid-range cage builds.
Best for: Builders looking for a robust DOM option that still remains workable for bending and welding in mid-length cages.
Caution: Ensure the tolerance and bend radius align with your machine shop capabilities to prevent kinks or wrinkles during fabrication.
Buying Guide
What tubing material should I choose? If you need high strength with light weight, chromoly (4130) offers superior strength-to-weight but requires precise welding and heat treatment. For broader availability and easier workability, DOM steel (drawn over mandrel) is a strong, consistent option compatible with most fabrication shops. Mild steel is common for budget builds but adds weight and corrosion considerations.
What diameter and wall thickness are standard? Common roll cage tubes include 1-3/4″ OD with .083″ to .109″ walls for cages, and 1-5/8″ to 1-3/4″ diameters for various chassis components. Thicker walls improve rigidity and crash resistance but are heavier and harder to bend. Choose based on intended cage design, vehicle class, and available fabrication equipment.
Are pre-notched tubes useful? Yes. Pre-notched or notched tubing speeds up assembly, reduces improvisation during welding, and helps maintain accuracy on alignment. For DIY builds, pre-notched options can save time, especially on complex cage layouts.
What about length options? Longer lengths reduce joints but require longer cutting and handling. Select lengths that fit your build sheet while minimizing waste. 7 ft and 10 ft options often capture most roll cage sections, while 10 ft can lower the number of joints in larger cages.
What safety considerations matter? Ensure materials meet the racing sanctioning body’s requirements for cage construction, including material type, wall thickness, and bend radii. Proper welding technique and heat management are critical for long-term performance and safety.
FAQ
- What is DOM steel? DOM stands for Drawn Over Mandrel tubing, offering consistent wall thickness and smooth finishes for bending and welding.
- Is chromoly better than DOM for roll cages? Chromoly is stronger per weight but requires precise fabrication; DOM is easier to work with and widely supported.
- Can I use pre-notched tubes for a full cage? Yes, pre-notched tubes speed up assembly, especially in complex cage designs.
- What should I consider about tube diameter? Larger diameters provide more stiffness but require bigger bend radii and more space; match to your design goals and space constraints.
- How do I verify fit before welding? Create a dry-fit mockup of sections to verify alignment, then clamp and tack before final welding to ensure proper geometry.
- Are there weight considerations for cages? Yes; heavier cages can impact vehicle handling and acceleration. Balance safety with performance needs and class rules.