Jump to content

Roll Cage 1.5 .095 or Lemons 1.75 .095

Black Magic

Recommended Posts

Working on my next car build, to replace the broken body shell and heavy, molested bolt in cage the neon had. I am thinking of using 1.5 x .095 wall tubing since at the neon weight scca, chump, wrl and aer allow it.


Lemons forces 1.75 x .095. I dont think my neon build lines up with lemons well, nor do i really like their format anyway. I have buddies with lemons cars i can use if i wanna go slow and get a pile of black flags....


Is it niave to build it to 1.5 x .095? What do most of you guys do? Any other concerns building to this size? Is lemons my only concern? 


Talk me into or out of it.....



Link to comment
Share on other sites

Our cage is 1.75 x 0.125.  We thought about the weight, then we thought about how a driver's license and a pulse are the only requirements to drive in ChumpCar.  Also did double NASCAR bars.  Would have done a full FIA rally cage if the rules didn't penalize for it.  Don't screw around on the safety stuff.

  • Like 2
Link to comment
Share on other sites

The list below is tube size od an id. Strength and weight per linear foot. 


It is one thing to use 1.5 tube if all the cars are of equal size and weight and another when running a series that has a vast variety as Chump. Between speed and size differential using the lighter smaller tube to save a few pounds doesn't really make sense, 


Not a fan either of building to the minimum spec either even if it is allowed,  




1.75 0.095 1.56 0.49 34,575 1.596 lb
1.50 0.120 1.26 0.52 36,416 1.769 lb
1.50 0.095 1.31 0.42 29,352 1.426 lb

Link to comment
Share on other sites

Another big factor i found out today. At my local steel supplier (to much of the nascar world as well). 


1.5 x .095 dom $5.23 a foot

1.75 x .095 true seamless cold drawn tube.... $2.85 a foot.


About 20 lbs heavier to do a cage, but about half the price. I had no idea. Those prices for 1.5 .095 seem about right?

Link to comment
Share on other sites

  • Technical Advisory Committee

What is the true seamless . How is it different then DOM? 


ERW (Electric Resistance Welded)

The nomenclature ERW refers to a specific type of welding process that involves both spot and seam welding. Seam welding is commonly used during the manufacturing of round, square and rectangular steel tubing. The steel strip is unwound from coils and side-trimmed to control width and condition the edges for welding. The strip then passes through a series of contoured rollers which cold-form the material into a circular (square or rectangular) shape. The edges are forced together under pressure as a butt joint and then welded by heating the material to temperatures above 2000° F. The flash weld that has formed is now removed from the outside diameter of the tube. Once the weld has been tested the tube then passes through a series of sizing rolls to attain its precise finished size, after which the tube is then straightened and cut to length.

The material used in the manufacturing process is typically SAE 1010. This product is typically available in Cold Rolled steel (CREW) for 0.060” wall and lighter and Hot Rolled steel  (HREW) for 0.083” wall and heavier. The product will come  in an “as-welded” condition, (often called – flash-in condition) referring to when the flash from the weld is left on the inside of the tubing, it is not normally removed or controlled during the ERW tube production process.

(DOM) Drawn Over Mandrel

Technically, DOM is not a type of steel tube, but rather the process in which the tube is finished. It is considered a high quality tube, and is normally constructed from SAE 1020 or 1026 steel. The first stages of manufacturing are identical to ones used to make electric resistance welded tube, but in the finishing stages the entire flash weld is removed and the tube is cold drawn over a mandrel. The cold drawn process provides the tube with better dimensional tolerances, improved surface finish and the strongest weld strength achievable. DOM is often incorrectly referenced as “seamless tube” when it actually does have a seam (although it is almost invisible).

Seamless Mechanical Tubing

The seamless tube is manufactured using a process called “extrusion”. During this process a solid steel bar is pierced though the centre using a die, turning the solid round into a round tube.

Basically there are two types of seamless tube:

  • Cold Drawn Seamless (CDS) normally made from SAE 1018, having precise tolerances and good surface finish
  • Hot Finished Seamless (HFS) normally made from SAE 1026, having less critical tolerances and a scaly finish – Not as strong as CDS
  • Like 1
Link to comment
Share on other sites

  • Technical Advisory Committee

I wish raleigh had the local steel suppliers like Greensboro and Charlotte do...  


I used 1.75x.120 for mine.  I will use 1.75x.095 for the next one.  I'd skip the 1.5 stuff.  The weight penalty is minimal and the 1.75 is MUCH MUCH stronger

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...