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  1. Not a lot of information to go on, but I would suspect the rim tape you are using (even with two layers) is not good enough. Given how expensive TPU tubes are, I would spend a bit more to get a name brand quality rim-tape and re-do that as a troubleshooting step. I have a feeling it will fix your problem, good luck!

  2. Had the same issue, now I have 3 layer and no more issue. Waiting for my thicker layer and I’ll swap. Those red layers are pretty thin

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