Beadlock wheels are a type of wheel used in off-roading that lock the tires bead to the wheel, allowing the user to drop air pressure to a very low level, which increases the size of the tires contact patch, and in turn, increases traction, flotation, and more. Beadlock wheels are heavy because there is more metal and equipment used in their construction. They are not legal for on-road use in most cases due to DOT regulations, as two or more sequential beadlock bolts could break, and the beadlock ring could partially or wholly leave the rest of the wheel, causing a blow-out.
Beadlock wheels are for extreme off-roading use and are not for everyone. They are for truck and jeep drivers who want to unlock the full potential of their off-roading vehicles. If you go off-road a lot and airing down to 12 psi or below is necessary, then beadlock wheels may be a good choice for you. However, if you mostly drive on the road and never air your tires down, then you dont need them, and they may hurt more than help.
In summary, beadlock wheels are a type of wheel used in off-roading that lock the tires bead to the wheel, allowing for increased traction and flotation. They are heavy and not legal for on-road use in most cases. They are for extreme off-roading use and are not for everyone.