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"most TPU tubes use plastic valve stems, and the plastic deforms when the (metal) valve core in screwed in. Then the tube leaks, not because the material is porous, but because the valve doesn’t seal. "
Blah blah blah...
The Schwalbe Aerothan TPUs I've running hold air impressively. I chose these over lighter options hoping for less durability compromise, and thus far seen this.
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This foot tastes terrible! 
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