When I first got my truck I was filling up a flat off of the truck(the truck was still in the woods).I had the rims with the ring on the outside.I wasn't sure on how safe it was so I layed the tire flat and hit the side with a 2x3.The ring popped off and went just higher than the barn roof,which is 30".It looked like it would still hurt alot to get hit in the face.I towed the truck out with a flat,you can see the ruined tire in my pics.

http://community.webshots.com/photo/551424330/2061074150092821122FDOUxa#