I recently decided to try TPU tubes with the understanding that CO2 inflators will not work, as the cold air can crack the tubes. To combat this, I purchased one of the Cycplus mini electric pumps to use as an emergency inflator. When item arrived the instruction manual warned against using on plastic stem TPU tubes, as the heat from pump can melt the plastic stem. ....Great.
Glad to hear RH came out with these metal stem tubes. I'll give them a try if my plastic ones melt after an emergency inflation with the Cycplus.