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neilbah
A couple of months ago I brought up those Chinese Ridenow TPU tubes and having invisible leaks on two of them. After some googling it turned out to be a common problem, especially in the bigger MTB versions of the tubes. Leaks become apparent at a certain PSI so you can sort of know the area when you dunk the entire inflated wheel in water but won't be able to locate it outside the tire due to the pressure limitations of the TPU material.
At this point, I've gone through 6 Ridenow TPU tubes and they all failed like this. All of them still usable but they all developed tiny invisible leaks which is incredibly annoying - have to pump them up every day or every couple of days.
It's a shame because the weight and ride difference is very noticeable but I think this will make me go back to butyl.