ECORS Class A race rig build

[broncosbybart]

these arms were fabbed from 2" .250 wall. I wouldn't make them out of tubing that was any smaller, myself. It is pretty easy to ding .120 wall stuff. I like the 1.25" heim ends. You can get away with 3/4" heims, but I have read a few places that people were breaking them. Not sure what they were doing to break them, but.... The original radius arms that were on the trail rig when I got it were 3/4. They are way smaller than the 1.25" heims. I personally didn't like them so much, especially when they were attached by a 1/2" bolt. To give them a fair shot, they were working fine when I took them off, and I am sure they saw some hard use. When you run the misalignment spacers on the 1.25" heims, the bolts used are 3/4, which I like.

I'd definitely go longer on the radius arms. I wasn't sure what the rules were going to say about long arms at the time I fabbed them, so I wanted to avoid any issues. The flex I am getting isn't as much as I thought it would be, but that is ok since it keeps the body roll down in the high speed corners. The longer Duff's arms on the trail rig flex like crazy.

More than anything, the bend in the radius arm tube is done for tire clearance while turning when larger tires are run. You might be able to find an exhaust shop to bend the large heavy walled tube. i'd call around on that one. Robert and Keith broke a die and had to fix/modify it to bend the .250 wall stuff.