I have never personally had this happen, or even seen this happen with the nitro shoes or any other Jaco tire. I can't believe I have never seen one of these "bad tires" because I have used a lot of tires this year and never had a problem. What size are you running the tires at? What kind of truer are you using? Is your truer bit wore out? I've had a bad bit mess some tires up before so thats always a possibility. I just have to believe something weird is going on for this to happen more then once.