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First impressions of RH TPU tubes are as expected.
They hold air well - similar retention to butyl and much better than latex. I took more installation care to ensure that the tube was aligned with itself and the valve stem, mainly because TPU doesn't feel particularly stretchy. Ride quality is not remarkably different than tubeless for 650x42 Babyshoe Pass EL. A TPU is considerably lighter and smaller in the spare kit.
This may be a good alternative to tubeless for wheels that don't get ridden that often, where sealant collects and hardens.
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