Well it happened to me. I thought it wouldn't. I bought the new Stan's rims hoping I could go tubeless. I mounted up the rear with no problems. Sealed easy and stayed sealed. I went on a ride and it worked great. So I mounted up the front (Mythos folding). Sealed great, stayed sealed for 3 hours. I put the front wheel back on the bike. Then as I was putting the rear wheel on--- KABOOM! Loud ass noise at 10:00 at night (front tire blew completely off rim). Wife comes outside and says "what happened?" Well it does scare ya. I'm glad it didn't happen when I was putting the front wheel on. Now I think I'm going to be to nervous to try it again until tubeless tires come out for 29er's. I talked with someone at Stan's and he said they still think all 29er folding bead tires are to weak to try it. At least I can say that I like the rims, they feel soo light and spin up well, so they're worth it for me.