Cockroach rims indeed...about 4 years ago I got caught in a freak rainstorm and had an unfixable flat with my CR18 rimmed rear wheel about 14 miles from home. To make matters worse, it was raining so heavily my cell phone shorted out and I was nowhere near a gas station or other place of convenience. Standing in 8 inches of flowing water with sand and gravel suspended in it, and with no other options, I ended up riding home on the rim through several inches of water most of the way and several feet of water in some places. I remember lots of places where sand and rocks the size of cobblestones were literally washing over the road surface. By the time I got home I was sure my wheel was toast. The tire and tube were shredded, but the rim was fine except for a few small nicks and scratches from hitting rocks around the outer edge. Those wheels are still in use today.