I drove it down the highway. Seriously. The wife and I were just cruising down the highway and luckily we were slowing down to exit and BAM! I thought I had a blowout so I pulled off the road to change the tire only to discover that the rim had cracked. We didn't hit anything, there was nothing in the road or anything, it just went. We even turned around and went back once we had the spare on and ran the route again to make sure there wasn't something there and the road was totally clear.
Now SOA is trying to balk and say I hit something when the tire and rim are basically fine, it's not bent on one side or anything. It has the crack on the inside race, and two little one inch scuffs on the inside rim where I'm guessing it drug something on the undercarriage as the wheel crumpled. The tire appeared to be fine, not a mark on it.
It looks almost like the crack in this thread, only the crack doesn't veer towards the inside of the wheel well, it pretty much stays towards the far inside of the rim up against the spokes. That and my rim doesn't have the bent lip... because I didn't hit anything.
http://legacygt.com/forums/showthread.php?t=23642