They are illegal in the US due to the fact that they are not an error proof system of mounting. The DOT requires that a tire and wheel combination cannot come apart. They are also REALLY hard to balance. Most people who use them don't even bother attempting to balance the tire, since they never get above 5 mph.

Why are beadlock rims not street legal?

-Beadlock wheels are heavy because there is more metal and more equipment. -Beadlocks may not be legal for on-road use. In theory, two or more sequential beadlock bolts could break, and the beadlock ring could partially or wholly leave the rest of the wheel.

Are beadlock rims DOT approved?

The one major issue with those beadlock wheels is that, legally, they are not Department of Transportation (DOT) approved.