There's also "internal beadlock" too.

Link here

I have to ask: Why are beadlocks illegal for use on paved roads (in most states)?

from Staun's website: Regarding the legality of conventional bead locks in California, I contacted very helpful Public Affairs Officer Chris Johnson. Now, understanding that the California Vehicle Code book is very big (over 1,600 pages!), and has many changes every year, Officer Johnson did his best, with the help of "Commercial" officers, NITSA and DOT to answer my question:

"Are conventional bead locks against the law?" His qualified answer is, "As best I know, no, conventional bead locks are not illegal."

Officer Johnson and I both are interested in learning more from you. Please call him (714, 567-6000) or me, if you have been cited specifically for bead locks or know the exact facts for someone who has. In defence of both of us, rumours are unacceptable. We need the facts, ma’am, just the facts.

Staun Internal BeadLocks are literally invisible with the exception of the second valve stem and that also appears to be legal. They use conventional inner tubes, so as of this writing, neither Officer Johnson nor I see any "street legal" problems with the Staun Internal BeadLock™ system.

Mostly because (many/most/all?) beadlock rims are not DOT-approved ... that's about it. As long as you buy rims that are DOT-approved (is there such a thing?), no problem.

There are "beadlooks" and "streetlocks"

"Streetlock" is a product line, here. They look like beadlocks, but only just so. They're for looks only.