I started rubbing my head on this one, only because I see race trucks off-road all the time with beadlocks that do 140 mph on a dry lake bed, and they don't come apart so easily.
It's a DOT approval issue, for the most part, but here's slightly more:
from high-impact.dot net:
quote from high-impact:
</font><blockquote><font class="small">In reply to:</font><hr />
<font color="yellow"> Are Beadlocks legal on the street?
NO beadlock wheel is DOT approved. Including the military Hummer wheel. (The military is exempt from such nonsense). Some of the better ones are certainly well built and obviously stronger than most OEM wheels.
Ours balance up and drive just fine. We have driven them from California to Colorado and Utah and back. We have had no problems. As for the strict definition "are they legal?" this is a question for a lawyer. I dunno. I hear lots of opinions, they don’t all agree. Many people use them on the street. The DOT is a federal organization. Different states may have to be safer and stronger than factory DOT wheels. The problem is that the DOT has never written a specification for them to comply with, so they cannot "rubber stamp" them. Different states have different laws on whether you are required to comply with DOT approval, and on what parts. For liability reasons, I cannot legally endorse the use of beadlock wheels on the street.
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I tried finding out what the DOT has to say about it, and California VC, but came up with nothing so far...