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Are they aluminum or steel? is there a weld on the back side?
Spec's pictures are two piece.I just checked my new Douglas beadlocks and they are the same as yours Corvair.IMO what we are seeing is the clearance that they use when they make the centers and the outer spun parts. I never understood how the three piece wheel was welded together, but this makes it clearer. I would guess that when they put these wheels together, the center piece may have a raised rib 1/4" or so wide, that has the same or similar OD to the spun rings in the center. They drop a spun ring on each side of the billet center, then lay a weld bead all of the way around the center, that joins all three pieces, the billet center and both spun sides. This is the only way that I can see that they could get all three pieces welded together in one shot. The crack is there because they cant get the spun half to an exact tolerance, and don't want it to be press fit for ease of assembly, and to guarantee that both sides are easily seated aginst the center to ensure minimum runnout. That is how I would built them.......I am not going to dismount one to find out, but IMO that is what were seeing.Actually Fabr is going to be dismounting his rears in a couple days to change to the Champions. Mabey he will get us some pics.In any case let us know what you find out Corvair!