Either Peterson's or 4Wheeler magazine had an article comparing them to a conventional beadlock this month. During their testing they were unable to break a bead with the Staun, but did lose one on the conventional. Don't remember if they mentioned being DOT approved or not, but I think the second valve stem is a lot less obvious than a big ring bolted on the outside of the rim. They did say it could be used to get you off the trail or down the road a ways if you have a flat. Looks like a good idea to me.
I looked into them and they are very expensive and I have yet to find a dealer that carries them. Dealer cost is at least 200.00 each. They are DOT approved and you can supposedly run a ways on the street with your tire completely flat.
what is this guy talking about, in all my life i have never heard of a police officer cutting open someones tire just to check to see if they are DOT approved. i hope he dosen't pursue a career in law enforcement, if so goodyear is going to make a killing. :rofl: