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I am surprised Martin that they call them bicycle stems, being most serious mountain bikes at least have high pressure presta valves fitted. Having said that, never having had tubeless on my mountain bikes I don't actually know whether they use schraeder or presta vaklves on a tubeless setup.Either way, they look the bees knees for doing a tubeless setup on a motorbike.
Schraeder good enough for me but presta maybe even lighter for when the milligram counts
make sure they are strong enough... I like the design, but the seem anodized which means aluminum. Though will likely work and last, but motorcycles go much faster than bikes (as far I know )