All it takes is a good size pothole with the right shape. The one I hit I didn't even see. When I hit it it didn't feel bad, just kinda like, "Woops, need to avoid that one in the future!". Then as I accelerated the car started to shake pretty good and I knew. I hit the pothole such that the outer part of the rim with the spokes went in the hole and the unsupported portion on the inboard side of the rim hit the other side of the pothole first. No support + several thousand pounds of pressure on relatively soft aluminum = warped rims. My insurance covered it, but I had to pay the deductable. I think the rims were $450 or $550 apiece IIRC. I run the 17" stockers in the summer and 16" Sport Edition el-cheapos in the winter. I have already warped one of those too but they are only $100 shipped. Much more economical to replace. The 16s make for a much more comfortable drive in the winter too, since I take the chesterville back roads every day on my way to work in Augusta. I almost warped another 17" one on the Sandy River road in Fayette this summer, but the tire took the brunt of it and it ruined a set of summer tires instead by bubbling the side walls. Some luck huh? Good like with your search.