I had the same problem with a new 35mm G-1 on very tubeless friendly Boyd alloy rims (19+mm ID). Given the relatively small population (I would think) of BF users who have tried G-1's, its beginning to look like a pretty high failure rate. Competitive Cycle replaced the failed tire and said they were unaware of such failure problems. Scary to think that it could happen when using them. My 30mm G-1 speeds have been fine - so far.