Originally Posted by Bandrada

Thanks. The crack is at the weld at the vertical member and the seat stay yoke. There is also a hairline crack that has been there for a while I think running vertically at the drop out. The one on the weld looks pretty bad.

Haha, those were just some ideas some fella was tossing around. He's more of a computer guy than a welder. I'll look into the absense of heat treat, but the bike designer, NOT the fabricator, is the one who highly recommended heat treating in that area.