i heard somewhere 11/2" DOM is the best material to use? but just found out most co`s. use ERW or something . is this correct? what is it ,and is it better? any feed back would be appreciated. yhanks Jim

maybe its CRW would that be Cold Rolled wall ? what is 13 gage?

For the difference in cost between the ERW and DOM I would go with DOM. It has twice the strength.

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what is ERW though? i dont know

Maybe you mean EWT.
Electric Welded Tubing.

Has a seam where it is rolled and then welded together forming the tube.

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electric resistance welded http://www.ioportracing.com/faq/rollbar.htm

thank you , now i got it .so why do most co.s use ERW .cost savings ? can it really be that significant? does any one know if a chassis builder uses DOM. thanks Jim

From what I understand dom tubing is a second step to erw. So basicly they take erw and draw it through a mandrel to make dom for tighter tolerances.

Here is a little clip on how its done
http://www.steeltubeinstitute.org/process/Dom_Process.html

Here is some more info about it
http://www.pirate4x4.com/forum/showthread.php?s=&threadid=12322

just about all companies use electro weld. Berrien, beeline..etc. If its a factory frame and not built for race its most likely electro weld.

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